What to Wear and Bring Snorkeling in Cancun

Base Layer: Swimwear

Wear your swimsuit under your clothes to the dock. A one-piece or snug board shorts under a rash guard ride better under a life jacket for two to three hours than loose trunks, which tend to ride up once the vest is cinched. Quick-dry synthetic fabric beats cotton for the same reason it always does on the water: cotton stays wet, holds the chill on a breezy boat ride back, and chafes against the vest straps by the second stop.

Sun Protection: The Rule Most Guides Get Wrong

Here is the detail almost every packing list gets wrong. The common advice online is "bring reef-safe sunscreen." In Puerto Morelos, several established operators go further and ban sunscreen at the boat entirely, reef-safe or not. Wet Set's own site states no sunscreen or lotions are allowed on board; Absolute Adventure calls it forbidden, even biodegradable brands; Dive Puerto Morelos's Spanish-language policy says the same.

The legal basis is real but narrower than people assume: the park's management rules prohibit "non-biodegradable" sunscreen, a park regulation, not a Mexican federal or state law naming oxybenzone or octinoxate specifically. In practice none of that matters at check-in, because the operators simply say no bottles of any kind. A rash guard with UPF fabric is the practical substitute, which is exactly why several boats hand out free wetsuits or rash guards for exactly this reason.

Cover your shoulders and back with fabric, apply any sunscreen only hours before you leave the hotel so it has time to absorb, and reapply on land after the tour, never on the boat.

Wetsuit: When You Might Want One

You will not need one for warmth at any time of year. Sea temperature off Puerto Morelos and the Cancun reefs runs roughly 26-29.5°C across the calendar, and standard guidance for water that warm is a rash guard or boardshorts, no wetsuit, no booties. Some operators still hand out a thin wetsuit anyway, mainly as sun cover rather than insulation, since it does the same job as a rash guard without you having to pack one.

If you run cold easily or you're doing back-to-back stops for two-plus hours, ask your guide whether a wetsuit is available; it costs nothing extra on the tours that stock them and there's no shame in wanting one even in 28°C water.

Footwear

Water shoes or reef booties are the default answer for most of this coast: they grip on the wet dock ladder, protect against the odd sea urchin near rocky entries, and stay on your feet in the surf where a sandal would not. Sneakers are fine for walking to the boat and standing on deck, but take them off before you're in the water, wet closed-toe shoes are heavier and slower once you're actually swimming. Sandals with a secured back strap are fine for lounging at the beach club before or after, never for the activity itself, they slip off the moment you kick.

Barefoot works for soft sand entries only, and even then watch for shell fragments near the tideline. Flip-flops and any unsecured sandal are the one footwear choice to leave at the hotel: they come off in current, they cut feet on rock, and a lost flip-flop in open water is not coming back.

A quick reference for what to actually put on, dock day:

The short list, each item earning its spot in the bag:

• Rash guard: the substitute for sunscreen the boat won't let you bring
• Water shoes or reef booties: rocky entries and the dock ladder
• Dry bag: keeps your phone dry on an open boat
• Cash in small pesos: tips and the dock fee, cards rarely work at the pier
• Refillable water bottle: hours in the sun with no shade on deck
• Change of clothes: you will be salty and wet for the ride back
• Towel: some tours provide one, most don't; pack your own to be safe
• Hat with a chin strap or clip: an unsecured hat is gone in the boat's wake
• Sunglasses with a strap: same problem, worse if they're prescription
• Waterproof phone case or housing: for shots at the surface between stops
• Backup contacts or a glasses strap: see the section below before you pack either
• Motion-sickness tablet, taken before you leave the dock, not after you feel it

Inclusions genuinely vary operator to operator: this is drawn from what Puerto Morelos boats actually list, not a generic assumption:

Sourced from what operators actually turn away at the dock, not generic travel-blog advice:

• Sunscreen of any kind: several Puerto Morelos operators ban it outright at check-in, not just non-reef-safe brands
• Gloves and dive knives while snorkeling: banned under the park's own rules
• Anything you'd mind losing: rings, watches and jewelry come off easily in current and rarely come back
• Glass containers: not permitted on most boats
• Cotton anything: stays wet the whole trip and chafes under a life jacket
• Flip-flops or unsecured sandals: the footwear that slips off in the surf
• Food for the fish: feeding marine life is a banned activity in the park, not a courtesy request

This is worth planning for, not winging. If you wear contacts, take them out before you get in the water. Eye-health guidance is blunt on this: water and contact lenses carry a real risk of Acanthamoeba keratitis, a painful eye infection that is hard to treat and can require a corneal transplant in serious cases. If you're going to snorkel in lenses anyway, use daily disposables and throw them away right after, never reuse a pair that got wet.

For glasses wearers, there are three real routes to a mask you can actually see through. Drop-in lenses are the cheapest option, stock lenses in fixed diopter steps that snap into a standard mask, though they don't correct astigmatism. Inserts or retainers hold your exact prescription inside the mask and are the middle option on both price and fit, though they're a bit fiddlier to clean and can fog more. Bonded lenses are ground to your prescription and permanently fused to the mask's faceplate, the most expensive route but the best for defogging and the only one that handles a bifocal prescription well. Whichever route you pick, order it two to three weeks before your trip. Rental masks at the dock are never prescription, and there's no same-day fix once you're standing at check-in.

Most Cancun-area snorkel boats are short open pangas making two or three stops, and for some people that's enough motion to matter. The honest picture, not the wellness-blog version: medication works best taken before you feel anything, not after. The CDC's own travel guidance says motion-sickness drugs are most effective when taken before exposure rather than once symptoms start, and the drugs shown to actually work are scopolamine and sedating antihistamines like dimenhydrinate or meclizine, not the non-drowsy allergy pills most people already have in their bag, those don't do the job here. Scopolamine isn't for everyone; it's contraindicated with glaucoma and some prostate conditions, and it's generally avoided in children.

Ginger and acupressure bands are worth naming honestly too, since they get recommended constantly: the same CDC guidance calls the evidence for both weak and contradictory, not proven, not useless, just unproven. If you want a free backup, sit toward the middle of the boat, keep your eyes on the horizon rather than your phone, skip a heavy or spicy breakfast, and get fresh air rather than ducking under a cabin roof.

Bring pesos, not dollars, and bring them in small bills. Group tours run smoothly on roughly 100 pesos per person for the guide, private tours run closer to 10-20% of the tour price. Some boats also collect a small dock or conservation fee in cash at check-in rather than folding it into the online price, so having a stack of small notes avoids an awkward wait while someone finds change.

Cards are rarely accepted pierside in Puerto Morelos, and the currency exchange at your hotel is a worse rate than an ATM in town.

A short list of things that only slow you down: any sunscreen bottle, since it likely won't make it past check-in anyway; jewelry you'd be upset to lose; a full-size towel if your operator already provides one; long dive fins, which are built for scuba and awkward on a snorkel boat; a paper map or guidebook, since your guide already knows the reef better than any printout; and a big camera bag, a waterproof phone case handles most of what you'll actually want to shoot from the surface.