Our first visit to Cozumel was to dive. I had a package from Aqua Dreams which included diving and hotel. Currently an open water certification course is $350.00, takes 3-4 days and includes all equipment in the price.
Two-Tank Dive Trips 1-2 Days 3+ Days
Three-Tank Dive Trips $85.00
One Tank Night Dives $40.00
Papa Hogs Shore Diving Tank Rental $6.00
Equipment: You can rent just about everything that you would need. I had my own console, mask and flippers.
B.C AND REGULATOR ON BOAT TRIP 10.00 PER DAY
WET SUIT 5.00 PER DAY
COMPUTER 5.00 PER DAY
RENTAL LIGHT 11.00 PER DAY
Along Avenida Rafael Melgar, you should find a few diving and snorkeling outfits, but the best locations are on other parts of the island. If you are pressed for time and need to get back to the cruise ships, this might be a decent option.