Just looking at your trip real quick, I think the highlight is going to be seeing Big Mike
Actually, we meet up at Dorney on Friday, and after that you have a sightseeing day, an open day, Great Adventure, and then another sight seeing day.
Since you are up as far north as you are going to go in Dorney, you "could" conceivably go right down the whole Jersey coast and collect everything, including Moreys Pier and Cape May NJ unless you have them already. They both have 6 coasters each.
You are also skimming right around Dutch Wonderland too.
Thats just the credit whore in me speaking, sightseeing time is cool too, especially Washington DC.
Peace, Big Mike