JOTTOI just looked it up. You'll be 2 hours from Big Boulder (Awesome parks, some of the best on the east coast) which is pretty much the most worth driving to. I wouldn't really recommend anywhere else.
Sorry, but if you had to look up how far boulder is from philly, you probably have nothing relevant to contribute here. If all you want to ski is park every day, boulder is fine, but if you value any sort of other varied terrain, it's got absolutely nothing to offer. Nothing in the greater pocono area, with the exception of some of the treeskiing at frost, can compare with the terrain at blue overall, and blue's park is, at least in my opinion, on par with what boulder's been putting out the past few years. Coincidence that people have left boulder to come work park crew at blue this year? Maybe, maybe not.