I'm south of Allentown in Quakertown (about 20-30 minutes down either Turnpike or rt. 309). Could probably look for an apartment anywhere from Quakertown and north.
Here's the 2 closest riding areas I know of: (never been to either. I have a cabin in Central PA and that is where I ride)
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State Forest Trail closest looks to be the Dixon R. Miller Recreation Area: ATV Trails in State Forests