on grand cayman you can walk to eden dive shop with your gear and dive right from shore.in the marine park its great,its only 12 dollars to rent tanks and you can get in 2-3 dives if you want . i have done this 3times and there great dives and inexpenseve,you can get 40 -50 feet out of them and at least an hour dive .and spend as much time as you like it across the street from margaritaville. and in cozumel i like the scuba club been diving with them for 12 plus years . have fun.