Yeah, on the atlantic side of Key Biscayne in Biscayne national park there is a beach that consists of lots of baserock up to the shoreline which creates lots of tidal pools at the edge of mangroves. Then a little further south is a sand beach filled with various macro algaes, kelps, and all the organisms that love to live amongst them in very shallow water. Great place to go snorkeling. Teeming with the kind of life you have in all your snail tanks Donya, prolly right up your alley . Only drawback is that its a bit of a hike to get there and the beach is frequented by folks from Miami's rainbow district. An amazing place for wildlife though.