Marvin Key is a small mangrove island in the Florida Keys backcountry, north of Sugarloaf Key (so roughly 20-25 miles northeast of Key West, depending on the route). Accessible only by boat.

Why is Marvin Key so popular with locals?

The sandbar is one of the longest in the Lower Keys backcountry, the water is shallow and protected, the run from Key West is doable but not so easy that everyone goes. It hits the sweet spot of remote-but-reachable. Weekends draw 30-50 local boats; weekdays you might be alone.

Is it a full-day trip?

Yes -- Marvin Key is full-day from Key West. About 75-90 minutes each way depending on route and conditions. A 7-8 hour charter gets you 4-5 hours on site, which is the right amount.

What's the best tide?

Mid-tide on the way out, low tide at the destination is ideal -- that's when the long sand crescent emerges. Captain Dustin reads the tide table and times the trip around it. High tide submerges the bar but still gives you shallow clear water to wade in.

Marvin Key is full-day only -- from $1,795 on our 30' Jeanneau, up to $2,495 depending on duration. Up to 6 standard. Includes captain, fuel, gear.

Marvin Key Sandbar Key West | Locals' Spot

Three reasons locals make the run.

Marvin sits in the sweet spot -- far enough from Key West to filter out the casual traffic, close enough that the half-tank of fuel is justifiable.

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The long sand crescent

At low tide Marvin's sandbar emerges as one of the longest in the Lower Keys backcountry. You can walk it for a quarter-mile, plant a chair anywhere, and not be near another party.

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Weekend social scene (optional)

Weekend afternoons Marvin draws local boaters — 30 to 50 boats anchored across the bar, music drifting, a built-in social vibe. Pick a weekday and you'll often have the bar to yourselves.

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Mangrove fringe

The island itself is small with classic Lower Keys mangrove edges. Kayaking or paddleboarding the channels around the island is its own experience — we can arrange SUP through our partner network with notice.

A full-day backcountry run

What a Marvin Key day actually looks like.

From our dock at the Perry Hotel & Marina, Marvin is a 75-90 minute backcountry run depending on route and conditions — up the Hawk Channel or through the back side of Sugarloaf. The trip itself is part of the day — long shallow flats, the occasional dolphin or tarpon, mangrove islands sliding past.

Timing the tide.

Marvin's sandbar is best at low tide. Captain Dustin watches the tide table and times departure so you arrive as the bar is emerging. Mid-tide on the way out, peak low at anchor, rising tide on the way back. Easier to plan a Marvin trip on tide days than wind days.

Pick weekday vs weekend.

Weekend Marvin is a social scene — 30-50 local boats, music, the occasional raft-up. Some guests love that; others come specifically to escape it. Weekday Marvin (Tuesday-Thursday) is almost always quiet. Tell Captain Dustin which vibe you want when you book.

What guests do here.

Walk the sandbar. Anchor in shallow water. Bring a cooler. Snorkel the patch reefs around the keys (Captain Dustin knows the right spots). Beach volleyball if you brought a ball. Some groups bring kites — the prevailing easterlies make the bar a good kite spot.

Two ways to spend the day.

Marvin is full-day only. Both options launch from our Perry Hotel & Marina dock on Stock Island. Private-charter only — no group tours run this far.

Most flexible

Private Boat Charter

Full-day, your group, our Jeanneau, USCG-licensed captain. From $1,795. Up to 6 standard, 8 by arrangement.

See private charter →

Pontoon (bigger groups)

Hurricane Hole Pontoon

If your group is closer to 12. Our 30-foot Beach Party Pontoon from Hurricane Hole can run to Marvin on calm days — bigger deck, BYO music, more deck space for a party group.

See pontoon charter →

The questions guests ask first.

Where exactly is Marvin Key?

In the Lower Keys backcountry north of Sugarloaf Key, roughly 20-25 miles northeast of Key West depending on the route. A small mangrove island with a large surrounding sandbar.

How long is the trip out?

75 to 90 minutes each way depending on weather and route. A full-day charter (7-8 hours total) gives 4-5 hours on site, which is the right amount for Marvin.

Can I see it on a weekday vs weekend?

Weekday Marvin is usually quiet -- could be 5-10 boats, could be just you. Weekend Marvin is a social scene with 30-50 boats. Captain Dustin can advise based on your dates.

Are there bugs?

Mangrove backcountry -- yes, no-see-ums and mosquitoes can be present at dusk and on windless days. Bring repellent. We carry some aboard. Wind reduces them significantly.

Can you snorkel here?

The sandbar itself is sand, not reef -- limited snorkel value at the bar. Patch reefs around the keys do hold fish; Captain Dustin can run you over for a quick snorkel stop.

What does it cost?

Marvin Key is full-day only -- from $1,795 on our 30' Jeanneau, up to $2,495 for the longer 8-hour version. Up to 6 standard. Captain, fuel, gear included.

Ready for the locals' sandbar?

Tell us your date, group size, and weekend-or-weekday preference. We'll match it to the tide and have you on the bar by midday.

Pick the sandbars you’d like to visit.

Your captain matches destinations to the wind, tide, and conditions of your booked day. Selections become a request the captain will confirm before your trip.

Pick at least one sandbar to see your recommended charter.

Or call (305) 906-2880 to plan with the team

Or email info@sixfinscharter.com with your date and group size.

Marvin Key — the locals' weekend sandbar off Sugarloaf.