Had a awesome stay on Singer Island, FL this summer at the Ocean Pointe. The place had free table tennis, free putt-putt, free billards, and a kid's activity center. There were some activities with a small fee, but several free activities. My boys, 11, 9. and 7 had a blast. Oh yeah, they loved the ocean and the pools too! Anyway, where are some other US locations that cater to families in this way?
I should point out that the Ocean Point website hardly mentions all of these free and low cost activities.
Rick6410, you can try using our vacation planner tool: http://www.marriott.com/explore-and-plan/vacationplanner.mi and select families under activities (and any other filters you wish to use). This should give you all the Marriott hotels that may be more catered to family travel. Hope this helps.