Blue Knob State Park might be my favorite place to camp in Western PA. It sits on the flanks of the second highest peak in the state. The hiking here is really spectacular with lots of scenery, overlooks, and side trails that extend many miles out into state forest lands which are adjacent to the park. The campground is small and fills up pretty fast, so check out an online map and book in advance. Clouds blowing east from the Midwest tend to break on the mountains here at Blue Knob, so short little bursts of rainfall are frequent, and they don't always show up on weather apps. Come prepared for short rain showers, chilly air even in the summer, and great views.