We go to WDW every summer--June30 to July6, give or take, and I will never go to the parks on the 4th of July. Even Spring break and Christmas aren't that bad. The other days aren't bad if you go in the mornings and head back to the pool around 2 pm. It's awfully humid, and, besides, it usually rains about 3:30 or so for about 45 minutes. As a teacher, I always go down to Florida on vacations, and each one has their good and bad parts--in the summer, the heat and humidity are definitely the bad parts! If you want to see the firework, and avoid the crowds, you can go to the parking lot at Wilderness Lodge. They set off the fireworks on the other side of the trees, and you can see everything!