If you get one full day on the water in Tampa Bay, spend it on this one. Egmont Key and Shell Key sit a few miles apart near the mouth of the bay. One is an abandoned island fort you can snorkel over. The other is an untouched barrier-island sandbar with the best shelling on this stretch of coast. Neither one is reachable by car, which is most of the reason they are still worth visiting. Here is the itinerary I run.
10:00 AM: Depart St. Petersburg
Board at our private marina, stow the coolers, and go up to the flybridge for the run south. The route to the mouth of the bay takes you past Pass-a-Grille and under the Sunshine Skyway. Have phones out for that part. The bridge from water level is a photo you cannot get from anywhere else. Dolphins work the wake on this leg most days.
11:00 AM: Egmont Key
Egmont Key does not feel like Florida in 2026. The island sits at the entrance to Tampa Bay and holds the ruins of Fort Dade, built during the Spanish-American War and now half swallowed by dunes and sea grape. You can walk the old brick roads, climb around the gun batteries, and see the 1858 lighthouse, which still works. Then get the masks out. Part of the fort sits submerged in 3 to 8 feet of clear Gulf water off the southwest side, and snorkeling over a fort is not something you get to do twice. I anchor close and run you in.
1:00 PM: Lunch Aboard
Lunch is whatever your group packed into the galley, eaten on the shaded aft deck while we reposition north toward Shell Key. It is a 30 to 40 minute run. Most guests spend it asleep on the flybridge.
2:00 PM: Shell Key
Shell Key is 1,800 acres of protected, undeveloped barrier island. There are no docks and no buildings, just a long white sandbar running into water the color of a swimming pool. The shelling is genuinely the best in the area, and lower tide is when the fresh stuff is sitting there. The shallows stay warm and calm for hours, and the dolphins work the channel edges more or less constantly. This is the part of the day where the anchor goes down and nobody has anywhere to be.
5:00 PM: The Golden Ride Home
The return leg is timed deliberately. Running back up toward St. Pete, the sun drops toward the Gulf behind you, and on a 5pm to 6pm return the whole bay goes gold. If you booked the hours for it, stay out for the full sunset. Our sunset spots guide explains why I finish off Pass-a-Grille.
Timing the Trip: Tides and Weekdays
Two scheduling choices make this day noticeably better. Tides first. Shelling at Shell Key peaks at lower tide, when the fresh shells are sitting exposed on the bar, and mornings usually pair that low water with the calmest conditions. I time the stop off the tide chart, so if shelling is the point of the trip for your group, tell me when you book. Weekdays second. The same day is $500 an hour Monday through Thursday instead of $600 on a weekend, and the anchorages are much emptier. On a Saturday you share the sandbar. On a Tuesday you can have a stretch of it to yourselves.
Why the Yacht Beats the Ferry
You can get to Egmont Key on the ferry from Fort De Soto, and plenty of people do. What differs is everything around the island time. The ferry runs on its schedule and the yacht runs on yours, so you can stay an extra hour at the fort or leave early for the sandbar without watching a clock. On the ferry you carry everything you brought across the sand. On the Marquis the shaded aft deck, bathroom, galley and cold cooler are a few steps from wherever you are swimming, and the swim platform means you never have to make a beach landing. Add three decks for 13 guests, Starlink WiFi for whoever cannot switch off, and life jackets in every size from infant to adult already aboard.
What to Pack
Keep it simple. Swimsuits and towels, water shoes for walking the fort ruins, reef-safe sunscreen, and a dry bag or waterproof case for the phone that is going in the water whether you planned it or not. Food and drinks are BYOB with one rule: no glass bottles aboard. Cans, plastic and koozies are perfect, and we provide the ice and cooler space. The complete packing guide has the full checklist.
What the Island Day Costs
The 6-hour version is $3,000 on a weekday and $3,600 on a weekend, all-inclusive. That covers captain, crew and fuel for the whole two-island run, with nothing added at checkout. Split across a full boat of 13, it is roughly $231 per person on a weekday and $277 on a weekend for six hours. A 50% deposit holds your date and the balance is due seven days before departure. Our Tampa Bay charter cost guide has the rest of the numbers.
Booking This Trip
The full two-island day works best as a 6 to 8 hour charter aboard the 52ft Marquis Flybridge. Up to 13 guests, all-inclusive rates of $500/hr on weekdays and $600/hr on weekends, captain and crew handling everything. Bring reef-safe sunscreen, water shoes for the fort ruins and a dry bag for phones. Book the island day or call (727) 609-2248.
Shell Key and Egmont Key day trip: FAQ
Can you visit Shell Key and Egmont Key in one day?
Yes, and it is one of our most popular full-day itineraries. Both islands sit near the mouth of Tampa Bay, about 30 to 40 minutes apart by yacht. A 6 to 8 hour charter covers both with a long stop at each, plus lunch aboard in between.
How do you get to Egmont Key without a boat?
Egmont Key is reachable only by water, because there is no bridge or road. A passenger ferry runs from Fort De Soto on a fixed schedule. A private charter lets you set your own timing, anchor near the best snorkeling, and keep the yacht's shade, galley and bathroom a few steps away.
Is there anything on Shell Key?
No, and that is deliberate. Shell Key is an undeveloped 1,800-acre barrier island preserve, which is exactly the appeal: white sandbars, some of the best shelling on the Gulf Coast, calm shallow water and regular dolphin traffic. No shops, no buildings, no crowds.
What is there to do on Egmont Key?
Walk the ruins of Fort Dade, a Spanish-American War-era fort the Gulf is slowly taking back. Visit the working 1858 lighthouse. Snorkel the submerged fort structures on the island's southwest side. Watch for the resident gopher tortoises on the trails.
How much does a Shell Key and Egmont Key charter cost?
The 6-hour two-island day is $3,000 on weekdays (Mon-Thu) and $3,600 on weekends (Fri-Sun), all-inclusive, with captain, crew and fuel covered. Split across up to 13 guests, that is roughly $231 to $277 per person for the full day.
What should I bring on the island day trip?
Swimsuits, towels, water shoes for the fort ruins, reef-safe sunscreen, and a dry bag or waterproof phone case. Food and drinks are BYOB with no glass bottles allowed. Ice and cooler space are provided, and life jackets in every size are already aboard.