hey I went to the parks on 4th of July - okay most of the day was at Epcot - it is pretty big so even those crowds didn't over helm it.
that night I went to the MK - Mk was open until 2am that evening. we went in after the fireworks - saw the second parade and had a blast. most of the guests were leaving when we were arriving.
other things - swimming, love WDW pools, shopping - both in the resort and outlet areas, reading a book (I know boring for most but I love 'em), people watching, walking around the area - most of Disney property is just lovely.