They used to try and open everything, but at a time when college-age kids are away at school and highschool kids are playing sports or involved in other activities, it is hard to staff everything. Maintance staff and extras from admissions, merchandise, park services and security would work some of the rides. I haven't seen that in a while, but the park has allot less rides. I would bet on only one side of Rolling Thunder and Parachutes and the Sky Ride being closed.