While the Water Slide in the Weirs is closed there is Water Country over in Portsmouth which is @ 30-45 minutes away by car. As for Monkey Trunks at Funspot, Gunstock just opened a rope course with Aerial TreeTops, which has 5 distinct different courses of different levels, if you got through 5 courses it will take @ 3 hours, they are in the process of completing the zip lines down from the Summit to across the pond and these are due to be completed before 7/4/11.
As for the Weirs water slide, I think the pilot of the plane was blinded by the smoke from the volcano
