Is it worth carrying fins, or should I just rent them?

If you plan on snorkeling more than two days, it is worth it. Rental fins in Costa Rica are often heavily used, uncomfortable, or missing sizes. Short travel fins fit easily in a standard carry-on.

Yes. A 10L dry bag is essential for boat excursions to keep your phone, wallet, and dry clothes protected from salt spray and humidity.

Will my mask fog up in the tropical humidity?

Fogging happens due to temperature differences and facial oils. Scrub the inside of your new mask with non-gel toothpaste before your first trip, and use a drop of baby shampoo before each session.

Packing your own snorkeling gear for Costa Rica

Skip the rental fees and hygiene concerns by bringing your own mask and snorkel in a padded dry bag or a dedicated hard-shell case inside your carry-on. You only need a mask, a snorkel, and a pair of lightweight travel fins to cover most snorkeling spots along the Pacific and Caribbean coasts.

Choose low-volume gear. Look for 'travel-sized' snorkeling sets. Avoid full-foot fins unless they are short-blade travel fins (under 12 inches); otherwise, stick to open-heel fins that can be strapped over water shoes.
Protect the lens. Wrap your silicone mask in a microfiber towel or a soft cloth bag. Never pack it at the bottom of a suitcase where heavy items can crush the seal or scratch the tempered glass lens.
Nest your gear. Place your snorkel inside the mask or along the edge of your carry-on bag to save space. Use the space inside the foot pockets of your fins to store socks or smaller items to maximize internal luggage volume.
Defog solution. Do not bring liquid defog in a large bottle. Instead, pack a small travel-sized baby shampoo or a solid defog stick (under 3.4oz) in your clear liquids bag to comply with TSA/airline regulations.

Is it worth carrying fins, or should I just rent them?: If you plan on snorkeling more than two days, it is worth it. Rental fins in Costa Rica are often heavily used, uncomfortable, or missing sizes. Short travel fins fit easily in a standard carry-on.
Do I need a dry bag?: Yes. A 10L dry bag is essential for boat excursions to keep your phone, wallet, and dry clothes protected from salt spray and humidity.
Will my mask fog up in the tropical humidity?: Fogging happens due to temperature differences and facial oils. Scrub the inside of your new mask with non-gel toothpaste before your first trip, and use a drop of baby shampoo before each session.