If you are going to Cozumel as part of a cruise, here are a few things you can do for cheap or even FREE. Sometimes, actual excursions can be expensive, and if you are doing one in every port and you have 5 port stops on your cruise, that can easily add close to $1,000 to your trip. If you are looking to save a little money, check out these things you can do. With the exception of going to Tulum, but I still wanted to show off Tulum because it is just awesome there.
https://www.youtube.com/watch?v=8a0T7avj4-Y&t=183s