I stayed in a mini cabin for two nights at Gambrill State Park this month. It was after the 4th of July madness. The park was basically empty. I felt like I had it all to myself. The cabins are amazingly clean as well as the bathrooms. The staff was very nice -so kind that they delivered my firewood and they were sold 3 bundles for $12.
My cabin had a few power outlets, an overhead light and a porch light.
There only issues I had were the fact that there was no camp store, a semi busy road was located next to the park, the playground was a swing set with no swings and the camp sites were located very close to one another. Didnt matter to me because they were empty when I stayed there.
Its new to being listed on the internet. I feel like if you want privacy and a less hectic campground stay at Gambrill. Its very close to Cunningham state park which is apparently noisy with more outdoor activities for families.
I did not venture to the trails that are not accessible from the Rock Run site of Gambrill. I would of had to drive up the road and parked to access it. So I cant tell you about the trails.