We are planning a trip to Disney and want to add 2 days at US/IOA. There will be 2A, 3C(17,15,and 10). It will be sometime between the Sept 23 and Oct 6, depending on airfare and work schedules. When would be the best time or days to visit US/IOA? How are the crowds and do we need express pass? I visited many years ago in late Sept and we stayed onsite, but they were not even using the express pass from the hotel on most of the rides. We will probably do 1 park each day. Any suggestions would be helpful. Thanks.