We did the 2 park, 7 day pass for BG this past summer. We only went to BG, though. It was such fun. We stayed at the Super 8 Historic Area, and it was very nice. Rooms clean, pool clean, and the room was under $40.
A tip for you: The McD's near BG is crazy, crazy busy in the mornings.
Also, if they offer the meal deal that they offered last year at BG ($20 includes 2 meals and 4 drinks), it's a great deal. We shared both meals, one for lunch, one for dinner, and were full, and happily sipped our drinks throughout the day (you get vouchers for meals and drinks that you turn in when you pay) The meals included dessert, too. The Festhaus (sp?) in the Germany section has great food and it's air conditioned.