I am not a swimmer, but have snorkeled three of my 4 times at CC. The first time, I didn't get too far out. The second time at CC, I had brought my own gear and found that something was broke. We got the company to send us a part that was a better design and on my second venture into the snorkeling lagoon I was out for a long time. I saw Mickey, Minnie, and a small boat that I was able to stand on the roof with my head just above the water (I'm 5'7"). I learned to relax and just float when I got tired and to also trust my floatation vest and how to clear my snorkel without panicking. On our last trip to CC I had lots of trouble with water getting into my mask and didn't really have any success seeing anything.
The depth of the water is very deceptive. When I was above the boat it looked like I could just reach down and touch it with my hand, but was surprised that I could barely reach it with my feet. I would say that the water is at least 15 to 20 feet deep in many places of the lagoon. I never really noticed currents, but I could tell that the tide was coming in when I got back to the beach. The drawback of snorkeling for me is my bad eyesight. It was really hard for me to know where the statues were. They are marked with buoys, but I couldn't see them. I just tried to go where I saw other snorkelers gathered.