i snorkeled off the beach at css w/just my mask, snorkel, and water shoes because i didn't want to pack my fins. it worked out fine, and there was lots to see outside of the swim area at css. either side of the bay was pretty good and i will definitely do it again the next time we are there.
We bring our own snorkeling gear. I love grabbing it out of the beach bag and going out to the roped off area. I see some star fish and a few fish. It is fun. Although I dont get up early enough, another couple talked bout seeing rays just off the beach at CN early in the morning. Maybe in Feb. I will get up early and check it out.