Most of the walkways are concrete, not sand. There are some beaches, a swimming one and a snorkeling one. We did the Dolphin Encounter and did not get sandy at all, never noticed any during that. The bottom may be sand but it is very deep and you stand on a metal platform. And the Sea Lion show would be safe as well. We did not see even half the park so there might be more. We did see a trampoline but I do believe you have to cross sand to get to it. My girls liked shopping in the gift shops which was away from the sand as well. Hope this helps.