I can’t help a lot as I have only been diving in Cozumel once. I stayed on the island at Casa Del Mar and used Dive with Martin as my shop. The hotel was all inclusive with meals and drinks included. Dive With Martin was great, with small groups and the divemasters and boat helpers were excellent. As for picking the 5 best dives, wow. Almost any dive you do in Cozumel is going to be great. From a shallow experience on Paradise reef, to Palancar, to Devils Throat. They are all great. After your trip let us know how you enjoyed it and review the hotel and dive service for us if you can.