I went to Tulum while my husband and son swam with the dolphins.
Tulum was a great site and we didn't have enough time there and definitely worth seeing. Watch out for the vendors. I didn't bargain very well and realized later I paid way too much for the vanilla and a silver necklace. There seem to be American prices for everything. Tacos at Tulum for example were $8 but I'm certain the locals pay only a fraction of that.
Tendering is done by a local company. Island is first world compared to Jamaica. People were nice. Went on a Catamaran to Sting Ray City and had fun but I question the environmental impact of what is going on there. Did some snorkeling and again, seems like the coral is being killed by careless swimmers. Rained and got cold.
Taxi from the airport was $24 fixed price. Smooth check in. Didn't see much but Miami is lovely!
Dunn's River Falls was amazing! Bring water shoes or you'll have to pay $7 to rent them. It was a great experience. Went on a small tour of part of the island. Very poor, lots of desperate people wanting to make a buck. Will do anything for your money including begging, back flips or selling you junk. Bob Marley was around every corner.