We were at MK last July 4th, and it was very crowded! As it gets closer to the 4th, the park crowds will increase in size and it becomes difficult sometimes to just move around or find a place to sit. I beleive on that day, they closed the park (MK) to all guests at around 12-1:00pm, because they max'd out the parks capacity. Your ticket only guarantees you admission to "a Disney park", so my advice to you is go to another park that day, and enjoy. If you just must watch the special fireworks display at MK, then I would go the the 15th fl. at CR, and watch it there from the viewing platform. Have a fun time. My wife and I are arriving on 7/7 for a week, alone, celebrating our 30th anniv. We can't wait.