scuba dude at Shedd Aquarium in Chicago

A few months ago my mom and I went to the Shedd Aquarium for the first time! It was amazing, especially the huge Caribbean reef in the center. While we were there a scuba diver was in the tank with all of the fish! I so have to scuba dive in my lifetime (I've only been snorkeling before). Any suggestions about the best beaches for scuba diving?

It totally reminded me of this necklace I have in my Etsy shop!