What I love doing is first thing in the morning I go to a ride or 2 and grab fast passes for later. Then go on a major ride as it is still early and peak crowds have yet to hit. Then after a few hours go to the rides I have fast passes for get a couple more go on the ride with my original first pass and enjoy passing the longer ride lines.
As for anything else I would suggest taking in during peak times... Aladdin if it's playing, pirates, Its tough to be a bug 3D show, animation studio, muppets 3D, haunted mansion, most dark rides, r just relax and people watch.