I think our tops has been 3 parks in one day. We will usually do morning at one park, break in afternoon, swim, and dinner, then off to a park. One day we started at AK, hit the main attractions, got really hot and sticky, went to DHS for a little bit, caught the boat over to EPCOT and had dinner and hung out. I think one of the best times we had was just playing it by the seat of our pants and going where the wind took us so to speak. Something quite rare as DH and I tend to be a bit on the type A side. Maybe that's part of the magic at Disney!