When in July?

[Jeanine3kids]

I am planning a family trip for July of 08 with my family and my cousins I have three children there ages will be 6,4,2 my cousin has 2 children ages 9,6 all together we will be 9 people. My question is when in July should I go, Should I avoid July 4th? Are the crowds in July really bad some people say they are horrible while others say they are manageable. Does anyone have experiences with July that they can share? Also we are not planning on going to the parks in the daytime we were planning on going in the the evening and taking advantage of extra magic hours.

Please Help!