Devil’s Den

Should you go?

Devil's Den is a prehistoric spring inside a collapsed limestone cave — you descend a wooden staircase into the earth and surface-swim beneath a skylight fringed with hanging vines while sun rays cut through the water. There is nothing else like it in Florida, and the photos do not exaggerate.

It is privately run, reservation-only, and snorkel-or-dive only (no plain swimming), which keeps the experience controlled and the water clear.

Visiting

Snorkeling is $30/person for a 90-minute reserved session (includes John's Oasis day pass); scuba diving is $48/person, first-come-first-served, Open Water certification required. Reservations are required for snorkeling. A $15 walk-through pass lets non-swimmers see the grounds. No general swimming — everyone in the Den must snorkel or dive, and no flotation devices are allowed. Ages 6+ only; under-18s need a guardian on property. Verified against devilsden.com Sept 2026.

For scuba: Diving inside a prehistoric cave — you descend through an opening in the earth into a domed cavern where shafts of daylight cut through the water and Pleistocene fossils line the walls. For snorkel: Snorkeling inside a prehistoric underground cave — genuinely unlike anywhere else on this list, with sunlight beaming through a ceiling opening onto Pleistocene-era fossils.

One rule that catches families off guard and is worth knowing before you drive out: children under 6 are not allowed in the cave, no exceptions, even if they're strong swimmers — this is confirmed directly on the operator's own booking FAQ, not just a commonly repeated rumor. Reservations are genuinely required — people have driven multiple hours and been turned away at the door for not booking ahead, so don't treat this as optional.

Per the site's own booking page, snorkel reservations are non-refundable, though one free date change is allowed if you request it at least 72 hours ahead and rebook within 60 days of the original date — booking works as a $5 per-person deposit online with the remaining $25 due when you check in, and the site recommends arriving 15 minutes before your slot. Equipment rental (mask, snorkel, fins) is a $15 add-on if you don't bring your own. Be honest with yourself about the water temperature too.

It's cold enough that reviewers consistently note non-swimmers — people just dipping in rather than actively snorkeling — tend to last only 15-20 minutes before they're ready to get out and warm up. If you're bringing someone who isn't excited about cold water, set expectations accordingly rather than promising a long relaxing swim. What makes it worth the drive, cold water and rules aside, is genuinely unique: you're descending into an actual sinkhole, not walking up to a pool.

Sunlight beams down through the ceiling opening and lands on water clear enough to see the fossils embedded in the walls — reviewers regularly compare it to Mexican cenotes, and it's about as close as Florida gets to that feeling. Snorkeling itself is more restricted than people expect: no free-diving or breath-hold diving, a maximum depth of 8 feet for snorkelers (the deeper sections are for certified divers only), and no exceptions on the flotation-device ban.

You're limited to 90 minutes in the water per reservation slot, and mask, snorkel, and fins must stay on the whole time. Lodging is available right on the property if you want to make a weekend of it — an RV park, four cabins, a remodeled double-wide trailer, and a tent camping area.

On the fossils: what's embedded in the walls and recovered from the sediment over the years includes Pleistocene-era animals — dire wolves, mastodons, saber-toothed cats, ground sloths, ancient horses and camels — alongside human remains dated to roughly 7,500 B.C., about 9,500 years old. (You'll sometimes see a '33,000-year-old' figure attached to Devil's Den online; that number tracks closer to the age of the cave and spring system itself, not any recovered human remains, so treat the two facts as separate.) Photography is allowed for snorkelers — phones, cameras, and GoPros are fine in the water — though selfie sticks and GoPro poles aren't permitted, and divers face tighter equipment restrictions than snorkelers do. One more rule that surprises people: no sunscreen is allowed in the water, chemical or otherwise, to protect the fish and turtles living in the cave — rinse off or use a reef-safe option before you get in line for the stairs.

When to go

The first booking slot of a weekday morning. Light beams through the ceiling opening are strongest in the middle of the day, but the water is emptiest at opening.

Local tips

Book the first morning slot: fewest swimmers, best light rays, clearest water. Water is 72°F in a shaded cave — a thin wetsuit (rentable) makes the visit far more comfortable. Bring your own gear if you have it — snorkel, mask, fins — since renting adds real cost on top of admission; one family reported paying around $100 total for a family of four once rentals were factored in.

If you have underwater flashlights, bring them; the light beaming down through the karst window is beautiful, but a flashlight adds a lot when you're looking at the fossils in the walls. Weekdays after Memorial Day are reported as noticeably calmer than weekends, worth targeting if your schedule allows it.

Reviewers consistently flag the same two friction points: the staircase down into the cave is steep and can feel intimidating with gear in hand, so budget a few extra minutes and take it slow rather than rushing; and the strict no-flotation, mask-snorkel-fins-on-the-whole-time rules catch first-timers off guard who expected something closer to a casual swim spot. Multiple reviews mention the changing rooms and lockers as basic but functional, and recommend bringing your own lock since not everyone finds one available on busy days.

Regulars say the underwater visibility is noticeably better in the morning before dozens of fins have stirred up sediment near the entry stairs, reinforcing the value of booking that first slot. People who've done both note the cave feels genuinely small and intimate compared to open springs — there's no wide area to spread out, so a full 90-minute slot with a crowded group can feel closer and busier than photos suggest.

Rules & restrictions

Reservations required. No plain swimming — everyone must snorkel or dive. Minimum age enforced. No GoPro sticks or floats permitted in the water. Children under 6 are not permitted in the cave under any circumstances, including strong swimmers. Reservations are mandatory for snorkeling — arriving without one risks being turned away entirely. Snorkelers are capped at a maximum depth of 8 feet — deeper sections are for certified divers only. No free-diving or breath-hold diving, no exceptions. No sunscreen, chemical or mineral, is allowed in the water — it's a small, enclosed cave system, and the operator asks everyone to rinse off beforehand instead. Selfie sticks and GoPro poles aren't permitted, though hand-held phones, cameras, and GoPros are fine for snorkelers.

Good to know

Dogs: No. Season: Year-round.

Facilities

On-site dive shop, gear rental, restrooms and changing rooms, campground, RV sites, cabins, and a swimming pool for non-snorkelers. The Ivy House, a small restaurant right on the property with real history behind it, is worth a stop if you're making a day of it. Next door, Cedar Lakes Woods & Gardens is a separate paid attraction some families pair with a Devil's Den visit — budget extra time and money if you want to do both.

Wildlife you may see

Little to see biologically, which is the point: this is geology, not wildlife. The odd catfish patrols the shallows.

History & background

Established in 1993, the property once belonged to a local farmer. Before it opened commercially, trespassers would hang ropes from the trees and jump into the water below, unaware of the prehistoric fossil beds and cave system beneath them — the transformation from unmarked hole in the ground to a destination people drive hours for is part of what makes it feel special today. Geologically, the cave itself is a collapsed limestone dome about 120 feet across at the surface opening, dropping to a maximum depth of around 54 feet — genuinely a sinkhole you climb down into, not a pool you walk up to.

Map & directions

Get directions →

FAQs

Visitor photos

See this week’s shots: Instagram #devilsdenspring · TikTok #devilsden

Great for: Scuba Diving · Snorkeling