Jenni, quite frankly, I think after diving coz in the AM you'll find that any snorkeling you do in the PM is going to be a big let-down. There are divers and there are snorkelers. Most divers started as snorkelers and there was a reason we all made the next step. 15 years ago I was snorkeling in coz on a day trip from a cruise ship and I found myself kicking on the surface through the bubbles from the divers beneath me. That was all it took because at that instant I knew I wanted to be DOWN THERE with them. I'd look for cool places to hang out in the afternoon with snorkeling being an afterthought as the next day you'll be back and down there again. Maybe check out the numerous beach clubs that offer a cool place to hang out and take your fins, snorkel and mask with you for some snorkeling about the shallows from the beach.