All the days, since busy will have the same long hours, and full entertainment.
If some of the kids can't ride the bigger rides, use Rider Swap. "The Rider Swap program allows multiple adults to experience an attraction while one adult waits with a child. You then "swap" to enable the other adult to enjoy the attraction." Just ask a Cast Member at the entrance of an attraction for a Rider Swap card and they will instruct you on what to do to use one.