Michelle, there is another ruins tour on the island of Cozumel itself. This one allows one to climb on some of the objects and is short enough to allow for shopping. The Tulum and others are on the main pennisula and you have to take the ferry over.
Good people sleep peaceably in their beds at night only because rough men stand ready to do violence on their behalf.
Courage and perserverance have a magical talisman; before which difficulties disappear and obstacles vanish into the air.
Pick your company wisely! Hang around people who are going to help you become all God created you to be.