We stayed in the Ritz Carlton Naples last April as a family on points. Hotel is great and there is a stellar kids club with a focus on sea animals and exploration. But other than the kids club we did not find it very kid friendly and it was a bit too far from town - so we were in the car a lot. Also, it was the Ritz - so the upgrade to a suite for the family was paid in cash (I think it was something like $350-$500 a night just for the upgrade) and the suite was not that impressive. And it goes without saying that all the amenities on the property were very expensive.

Never stayed at Treasure Island but hat sounds very interesting.