Is your kid accustomed to group care? Mine did not deal well with Turtle Track, and we ended up only using it as social time, with a parent in the room with him when he was there.

Be prepared for any particular part of your plan to fail spectacularly, but be prepared for unexpected pleasures, too. As with many trips/vacations I do involving my 3 year old, I did almost none of the things I wanted to do, but a number of things I wouldn't have thought to do that were fun anyway.