We stayed in North Pines campground on site 531. We were there this spring in early May and the water was rushing, the falls overflowing and some sites pretty soggy. Not ours. We were across the road from the river and from a rest room but there was no noise or traffic. We could see Half-Dome over the trees. Loved it. I think the regular rate was $30 a night and remember no hookups.
No mountain views, no serene lakes, no grass! We loved this camping space at the Campus Park and Ride. It is super safe, well run, has power, water and wifi and free shuttle service to the transportation hub at a hospital complex. From the hub you can get anywhere in Philly. The cost was a very reasonable $30 a night, for small trailers like ours and $13 for any vehicle you have. The staff were very helpful and cheerfully met you anytime on weekends with the shuttle - during the week they have regular and frequent runs. Great way to visit the historical treasures of the city.
What a super place. We were here in April of 17 after touring Washita National Memorial we drove a few miles to this site by the poorly named Upper Washita Pond Number 32! It is off highway 47 and then a couple of miles on a paved road and one more well marked turn into the camping area. I don't recall how many sites, maybe 15 or 20, but we were nearly alone that night as there was only one other unit near the entrance. We camped for $0 dollars with nice sunset and the sound of coyotes over the hills. There was water available and restrooms as well. It is located in the Black Kettle National Grasslands.
We stayed at Joshua Tree for three days in April 2017. The Blackrock campground provides easy access to the most interesting portion of the park, in my opinion. We stayed in site #45 and it was very nice, located on the side of a hill (slight) and close to a couple of trails. The iconic trees dot the campground. There is water available but no hookups. Cost was a very reasonable $20 a night. We also reserved in advance.
We stayed two nights at Gambrill State Park just outside of Frederick, Maryland. Our site was #20 with 30 amp power and water, flat landing pad, fire ring and couple of other touches. We paid under $30 a night in August of 2017. There are not many sites with power. We liked our site but 22 may have been a bit larger. It was screened and rather private. There were helpful camp hosts. We did miss the turn off into the park, it was dark. I would not recommend missing that turn as you go up, way up and then need to turn around on a narrow two-lane road in the dark. But if you have Josh the ranger on duty, you will be fine. Nice and super helpful guy. Easy access to historic areas and even DC is just 45 miles away.