Looking for suggestions for the best ideas for a long layover (about 10 in the morning until about 4.30 in the afternoon) in San Juan.

I'll have 2 small people with me so it'd be nice if they had either somewhere to completely chill for the day or somewhere they can do stuff to wear them out so they have a chance of sleeping on the overnight flight we're getting on <img src="http://www.traveltalkonline.com/forums/images/graemlins/Grin.gif" alt="" />

Any suggestions gratefully received. We're flying in on Cape Air from Tortola and out on Norwegian to London, if that's relevant...