If you need to ride and don't want to wreck the trails, try riding your mountain bike on the road (yes, the paved road Heidi). If you don't want to deal with traffic try these places:
Ironton Rail Trail in Whitehall
Rodale Fitness Park in Trexlertown
Trexler Park in West Allentown (bikes
allowed Tues,Thurs and Sat. I believe)
If Jonk gets over his cold we might post an urban ride this weekend. And if you just need to get out and exercise, come to Trexler Game Preserve this Saturday for some hiking and benchcutting.