Looks a good plan - the only thing I would consider is that you may not need a full relaxing day
We have 2 young girls and we often left the parks around 2pm and spent the afternoon by the pool before heading out for our evening meal and somtimes a visit to a park for parades/fireworks etc. This really charged their batteries!
Last year we spent our last full day by the hotel pool chilling before heading out for our last meal - the girls loved the Disney activities/games and we came home so relaxed people couldn't believe we'd been to Florida! Were definitely planning the same this year