Here is the packing list we have received from RAINFOREST and REEF:
* One duffel bag/suitcase to be checked in at airport and one carry-on bag
* t-shirts
* shirts-light-weight/long sleeve and short sleeved
* undergarments
* hiking shorts
* pants-light weight (jeans only for going out in the evenings)
* socks
* tennis shoes, flip flops, or sandals (tennis shoes recommended for hiking though)
* hat with visor for sun and rain protection
* rain gear
* windbreaker, sweat shirt, or sweater
* bandana
* swim wear
* small towel
* plastic garbage bag for laundry
* toiletries/ziplock bag
* medication/ziplock bag
* sunscreen, chapstick, insect repellent, afterbite for mosquito bites
* extra pair of prescription glasses/contacts
* small daypack for hikes
* plastic water bottle
* suglasses
* binoculars
* camera with waterproof camera bag
* mask, snorkel and fins (for the cenote)
* passport
* photocopy of passport
* driver's license or birth certificate copy (as extra form of i.d.)
* spending money (debit card/credit card or traveler's checks)
* journal
* books/cards/other reading material
* Spanish/English mini-dictionary