Going on weekdays, especially as school is starting to get back in session, you'll be more than fine. I just recently did Knoebels and Hershey on a weekend, and still we had no trouble getting every single coaster in. Saturday night at Hershey was very busy, but again, a Saturday night. But we still got 6 total rides in. Fahrenheit will most likely be your longest wait, so if you want 4+ rides definitely hit that up very first thing. Lightning Racer will be a walk on, and Skyrush shouldn't be bad either. Knoebels on a weekday you'll be fine, and definitely with Dorney. Haunted Mansion, the flyers, and the chair lift are the musts for me at Knoebels. Have fun!!