I tried "Discover Scuba" when in Cozumel about 3 weeks ago. It was great. They give you a quick class, you put on the equipment and then scuba for about 40 minutes at 25' to 35' following the instructor. You are not certified, but it introduces you to it to see if you might like it. I did so much and am starting lessons next week to become certified. Teenagers might enjoy that.