Florida Keys Best Coral Reef Snorkling and Diving Locations!
The Florida Keys are home to Earth's second largest coral reef, after Australia's Great Barrier Reef. There are so many amazing snorkeling and diving locations in the Keys and so much to see. You'll see reef sharks, nurse sharks, vibrant corals, rays, barracudas galore, rainbow parrot fish, midnight parrot fish and sea turtles. But where to go, specifically? Here are the locations, as described by professional dive and snorkling organizations and past Sea Base participants. many recent participants' experiences!
Best snorkeling locations
Let's start with the map and the provide descriptions after it!:
Here are some of the top locations that
Sea Base crews often visit.
And there's even an
Interactive Keys
Snorkeling Map on NOAA.
- Looe Key Reef - an AMAZING reef for snorkeling which immense diversity of life. Looe Key Reef is a spectacular, protected coral reef located 7 miles offshore of Big Pine Key and Ramrod Key in the lower Florida Keys. It is one of the most vibrant sections of the Florida Reef Tract. It has abundant marine life, including sharks, groupers, and diverse hard and soft corals. The depth varies from 7 to 15-foot waters ideal for snorkeling, to deep 30 to 90-foot spur-and-groove formations perfect for scuba diving. The reef gets its name from the British warship HMS Loo, which sank on the reef in 1744.
-
Alligator Reef was named
after the sunken
USS Alligator
and is located 4 miles off Islamorada. It generally ranges in depth from 10 to 35 feet, with many spots
around 20 to 25 feet, although some areas are as shallow as 8 feet. The reef features vibrant
coral formations surrounding the 136-foot Alligator Reef Lighthouse. The shallow 10-to-20-foot living coral
barrier reef boasts over 500 marine species! It is located within the
Florida Keys National Marine Sanctuary.
In November 1822, the USS Alligator, a U.S. Navy schooner on patrol to suppress piracy and protect merchant convoys in the Caribbean, ran aground on a shallow reef four miles off what is now Islamorada. Unable to free the ship, the crew burned and sank her deliberately. The Alligator Reef Lighthouse, a 136-foot iron skeleton structure, was completed in 1873. -
Hens
and Chickens Reef - is a shallow 106-acre patch reef located within the Florida Keys National Marine
Sanctuary just off Plantation Key in Islamorada. Accessible only by boat, it is famous for its distinct
cluster of coral heads resembling a mother hen and her chicks. Depths range from 5 to 35 feet. The site is
highly popular for snorkeling and diving due to its calm waters and unique topography. It features a maze of
coral mounds, purple sea fans, and abundant marine life including ESA-listed star and brain corals. You can
also explore the "Brick
Wreck," an unnamed barge that broke free in July 1949 and sits just next to the main light tower -
Cheeca Rocks -
Just to be confusing, aka, The Donut Hole at Cheeca Rocks (because there is another
donut hole at Patch Reef) is ocated
one mile directly off Upper Matecumbe (Islamorada area). It is a smaller "Donut" than the one at Patch
Reef and is part of French Reef (near Key Largo and Islamorada). It is 5” to 25” deep and 100 yards in diameter. -
The Donut Hole at Patch
Reef - It is off North Grassy Key (between Marathon and Duck Key).
It is a shallow, sunlit reef ranging from 15 to 30 feet in depth.
The reef's donut shape (with a sandy "hole" in the center) makes it exceptionally easy to navigate around.
There are beautiful coral formations at this reef.
Dive sites provide more information about this spot. - John Pennekamp State Park -
102601 Overseas Highway (MM 102.5), Key Largo, FL 33037.
Phone: (305) 451-6300. The park, known for incredible snorkeling, is a destination in itself. My scout crews spend time here before or after Sea Base. See this link: John Pennekamp for much more information. There is a pizza place nearby that opens at 11am daily and delivers to John Pennekamp for the Sea Base boat crews. It's called
- Tower Of Pizza - 100600 Overseas Hwy,
Key Largo, FL 33037
Phone: (305) 451-146.
Scouts love the pizza and adults love the other food they have, also.
- Tower Of Pizza - 100600 Overseas Hwy,
Key Largo, FL 33037
Sea Base Gear Guides
- Packing checklist

- Duffle bags, waterproof ($20 - $65)
- Snorkel and Mask - ($25 - $200)
- Clothing: sun hat, sunshirts, dive gloves, dive socks, sandals, Hawaiian Luau shirt, etc
- Water bottles
- Sunglasses, straps
- Neck gaiter / buff
- Rain poncho
- Misc: clothespins, paracord, clamps with paracord
- Towels
- Kits (first aid, personal hygiene)

- Sunscreen and bug lotions
- Sleeping gear - mats - pads, liner insert, pillows
- Electronics - headlamp, battery/power pack
- Cameras: waterproof, from $40 - $400
Islamorada and Coral Reef Sailing Tips, FAQs and Trip Information
- A typical Itinerary for Islamorada Coral Reef Sailing
- A Typical Itinerary for an Islamorada Keys Adventure Sailing (KS)
- A Typical Itinerary for an Keys Adventure Islamorada (KI)
- A typical itinerary for a Brinton (BEC Summerland Key) Fishing Adventure
- Ground Transportation
- Islamorada dorms - if you stay there your first or last night (unlikely, ask your trip organizer / leader)
- Glamping Tents - if you stay there your first or last night (unlikely, ask your trip organizer / leader)
- Souvenirs
- Sleeping on sailboats
- Laundry at Islamorada (if you have time there on the morning you return to Sea Base)
- Required forms, and tips to organizing them
- Fishing licenses (none needed)
- Florida Keys Fishing Tips (types of fish, photos, lures, baits, methods)
- Ship bathrooms (the Head), pizza and more oddball stuff.
- Paperwork
- Florida Keys Fishing Tips (types of fish, photos, lures, baits, methods) This page has photos of each type of fish and more information.
- Sea Base Adventure cost estimator, calculator AND packing checklist
- The full official 2026 Sea Base Keys Islamorada Sailing Adventure guidebook (PDF)
More Information
- FAQs : Sea Base frequently asked questions - the constantly growing FAQs page is here.
- Keys Islamorada Sailing Adventure packing list -
and here is the complete
Keys Islamorada Sailing Adventure
guidebook
This covers: Coral Reef Sailing, Eco Sailing, Sea Exploring, Keys Adventure Sailing, and Keys Adventure Islamorada - What can you do after finishing at Sea Base plenty of fun stuff nearby or on the way to the airport.
- The Unofficial Sea Base page with loads more information about Sea Base.
- Underwater Cameras, underwater and action cameras, GoPro's etc all options from $40 - $700
- Florida Keys Fishing Tips
- Merit badge requirements you can complete while on a Sea Base Adventure!
- Sea Base Forms, and tips to organizing them for a speedy check-in!
Portable Power Bank 50,000 mah, Ultra-High Capacity Battery Pack,2 USB Output High Speed Charging Power bank
Portable Camping LED Light and Fan, 40hrs Rechargeable Battery w Hanging Hook for Tent, Car, RV, outages, etc.