Union Island Cruise Port: Tobago Cays Turtle Snorkeling

Union Island barely has a port, and that is the whole charm. Your ship tenders you into tiny Clifton, but the real reason you are here floats just offshore: the Tobago Cays, where green sea turtles graze in impossibly clear water.

My quick take

If your ship calls at Union Island, book (or at least plan) a boat trip to the Tobago Cays before you are standing on the tender dock. It is genuinely one of the best half-days you will spend on any Caribbean cruise itinerary.

This is not something you improvise well at the last minute. It is a small island with limited boat capacity, so a plan beats hope every time.

Clifton itself will not take up much of your day. It is a few streets of shops, a market, and waterfront bars, so do not expect a big-port experience.

Come for the water, not the town, and you will leave happy.

The quick facts

• Where you land: Clifton Harbour, on Union Island’s east side, in the southern Grenadines of St. Vincent and the Grenadines.
• Dock or tender: Tender. Ships anchor offshore and shuttle passengers in by tender boat to the harbor.
• Into town: You are dropped right at Clifton’s waterfront, and a two-minute walk covers the whole town center.
• Currency: Eastern Caribbean dollar (XCD); US dollars are widely accepted, but small vendors appreciate exact change.
• Headline day trip: A boat excursion to the Tobago Cays Marine Park for snorkeling with green sea turtles.
• Accessibility in brief: Limited. This is a small tender port with no purpose-built cruise infrastructure (see below).

How I would confirm the tender plan

Union Island is a weather-exposed anchorage, and tender-only stops here are more likely than most to get adjusted or skipped if the swell is up. I would check your cruise line’s app or the shore excursions desk the evening before to confirm the call is still on.

I also would not book anything on land that depends on a guaranteed stop, like flights or hotel stays if you are doing a pre-cruise or post-cruise night.

Booking a Tobago Cays boat trip independently rather than through the ship? Ask the operator what happens if the ship’s call time gets shortened, because a good local one will already have a plan for that.

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Getting around

Clifton is genuinely walkable. It is a small grid of streets around the harbor, and you can cover the market, the shops, and the waterfront bars in under 15 minutes on foot.

Want to get up to Fort Hill for the view, or across the island? Taxis wait near the market, and minibuses (marked with an “H” on the license plate) run fixed routes, according to St. Vincent and the Grenadines’ official tourism site.

But the trip that matters, the Tobago Cays, is by boat only. There is no road there.

It is a cluster of uninhabited islets reached by chartered powerboat or sailboat from Union Island or neighboring Mayreau. This is not a place to arrange casually once you are already ashore with a short call time.

The marine park’s own website lays out the boat-access basics and park rules. Expect no anchoring on coral, a 5-knot speed limit inside the park, and mandatory local guides for scuba diving.

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What snorkeling the Tobago Cays is actually like

The turtle-watching area sits off the southwest edge of Baradal, and the appeal is how ordinary it feels once you are in the water. You slip off the back of the boat, put your face down, and there is a green sea turtle calmly cropping seagrass a few feet below you.

The lagoon is shallow and sheltered by Horseshoe Reef, so the water is usually calm and clear rather than choppy. That makes it forgiving for nervous or occasional snorkelers, though a flotation belt is still worth asking your guide for.

The park has firm conservation rules, and they exist for good reason. Do not touch the turtles, do not touch or take the coral, and do not stand on the reef, per the Tobago Cays Marine Park regulations.

Give each turtle space and let it surface for air on its own schedule. Reef-safe sunscreen, a rash guard for sun cover, and an underwater camera on a float strap are the three things I would not skip.

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The stops I would actually spend time on

• Tobago Cays Marine Park: Five uninhabited islets (Petit Rameau, Petit Bateau, Baradal, Jamesby, and Petit Tabac) ringed by Horseshoe Reef, with calm, protected lagoons that are some of the clearest water in the Grenadines. Fun fact: the turtle-watching area off Baradal’s southwest edge is a designated sanctuary specifically because green sea turtles feed there year-round.
• Clifton town and market: A small waterfront strip of shops, a produce and craft market, and a handful of laid-back bars, all worth a slow half-hour wander before or after your boat trip.
• Fort Hill: A short climb above Clifton for a panoramic look over the harbor and out toward the Grenadines, and a good option if you would rather stay on land.
• Happy Island: A tiny man-made bar built from conch shells in the middle of Clifton Harbour, an easy and offbeat stop for a rum punch with a view of the anchorage.
• Chatham Bay: A long, largely undeveloped beach on the island’s west side, reachable by taxi or boat, for anyone who wants sand and quiet rather than a snorkel tour. Fun fact: Union Island’s highest point, Mount Taboi, tops out at just over 300 meters (around 999 feet) and is a genuine hike, not a stroll.

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How I would plan the day

• Half day (3 to 4 hours): A shorter Tobago Cays snorkel run. Most operators can get you out to the turtle sanctuary, in the water, and back inside three to four hours if your call time is tight.
• Full day (5 to 7 hours): The classic combo, meaning a longer Tobago Cays sail or powerboat trip with a beach stop on one of the cays, lunch aboard, and time back in Clifton before you re-board.
• If you skip the boat trip: Walk Clifton, climb to Fort Hill for the view, grab a drink at Happy Island, and call it a relaxed island day. Just know you are passing on the main event.

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A realistic word on accessibility

I will be straightforward here: Union Island is not an easy port for anyone with mobility limitations. It is a tender port, which already means transferring from ship to a smaller boat, sometimes in swell, with no gangway-level boarding.

Clifton’s streets are simple enough underfoot for those who can walk short, uneven distances, but there is no dedicated accessible transport. The Tobago Cays trip itself involves boarding a boat and, for the full experience, getting in and out of the water to snorkel.

If mobility is a real concern, I would talk to your cruise line’s accessibility desk in advance about tender assistance. Consider whether a boat-based excursion is realistic for you before booking one.

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When to go, and the weather

The Grenadines stay warm year-round. Daytime highs hover in the mid-80s Fahrenheit whether you are there in January or July.

December through April is the busiest, driest stretch and the classic Caribbean cruise season. Hurricane season runs roughly June through November, with July typically the wettest month.

Storms are a real (if less frequent this far south) consideration into October. May, June, and November tend to be a good middle ground, with decent weather, thinner crowds, and calmer seas for that Tobago Cays boat ride.

One more seasonal note worth planning around: sargassum seaweed can drift onto windward shores in some summer months. It rarely spoils the sheltered Tobago Cays lagoons, but it is worth a quick ask to your operator if you are visiting between roughly May and September.

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Quick answers

Do I need to book the Tobago Cays trip through the ship? No, but I would lock it in ahead of time either way, whether through the ship’s shore excursion desk or a reputable local boat operator, rather than hoping to find a spot once you are on the tender dock.

Will I actually see sea turtles? Very likely, if you go to the designated turtle-watching area off Baradal, which is a protected feeding ground rather than a random hope-and-see spot.

Is the snorkeling okay for kids or weak swimmers? Generally yes, because the lagoon is shallow and calm, but ask your operator for life vests or flotation belts and keep young children within arm’s reach.

What should I bring on the boat? Reef-safe sunscreen, a hat, a towel, water, and some small US dollars or Eastern Caribbean dollars, the regional currency issued by the Eastern Caribbean Central Bank, for park fees, drinks, or a beach vendor. Most operators supply snorkel gear, but confirm that when you book.

Is Clifton worth exploring on its own? For twenty or thirty minutes, sure: the market, the shops, and a drink at Happy Island cover it. It is not a full day’s activity, though, so pair it with the water.

How does this compare to other Grenadines-area stops? It is smaller and more low-key than most; if you want a similar boat-and-beach focus with more built-up town options on the same trip, see our guides to Grenada or St. Lucia.

Union Island is not a port you go to for the town. It is a port you go to for what is just offshore.

If you have done the bigger, busier Windward Island stops like St. Kitts or Grenada and want something smaller and quieter with spectacular water, this is it. Get yourself to the Tobago Cays, and the rest of the day takes care of itself.