Captain Zach was knowledgeable of the area and told us about the area. We didn't see dolphins, but he was able to show us a sea turtle in the wild (which I think is more rare than seeing a dolphin), cool sea urchins, and lots of birds (herons, egrets, and ospreys). Shell Island was a nice little stop. Recommend dressing in sandals or flip flops and bringing a towel, as you will have opportunity to be on the beach and go in water if you want at Shell Island.