It's gonna be really crowded, sorry to burst your bubble. Local schools start the fall term on Monday, August 27, in which case the park is dead that week because everyone is in school. You're going a week too early, so everyone is gonna want to hit the park up for one last time before they go back to school.
A season pass would really help because you can knock out the big time attractions before the park opens to the general public. I would suggest that to use early entry. If you park in the Soak City lot, then everyone runs to Maverick, so you can get that before the line forms. Then, head to Millennium Force. After that, it will probably be park opening, so hit up Top Thrill. Once the big three are done, then do whatever you want, going from the back to the front of the park (everyone else does front to back). Hit up Raptor during dinner hours when everyone will be eating.
That was my plan when I went last summer, and my longest lines were 20 minutes for Millennium and Top Thrill. However, I went on a weekday in June, so the park had short/moderate lines. You're going in August, when the park is at peak crowd capacity, so don't expect the short waits that I had.
Hope that helps!