I just returned from a 2-night tent camping solo trip with my dog. This was my first time at Rocky Gap and I found some strong pros and cons.
Pros
Large camp sites, with decent space for tents. The descriptions on the State Park site seem very accurate. Mid week (Sunday and Monday nights) the campground was less than a third full, and the folks who were there were spread out so it felt more spacious than it was. There are some great trails for hiking, and the dog beach was perfect. You can rent kayaks, canoes, and SUPs, or bring your own for no launch fee.
Cons
It was very noisy at night due to traffic on I-68 and even the campground road, which despite a 15 mph posting has no speed bumps and seems to have a poplar straightaway for cars with loud mufflers who like to open it up. I don't know if the I68 traffic just sounds louder at night because everything else is quiet, or if the sound carries farther at night. But sleeping my tent, I was woken up many times by the sound of trucks down shifting and braking.
Another noise -- during the day I heard what sounded like the world's largest circular saw, only to discover that there is a large saw mill about 2 miles north. Fortunately that noise stopped by about 6 pm.
And finally, although there were only a few occupied sites in Dogwood loop, some were with very large groups with either no self awareness or no consideration for others. No fault of the park, and people did basically follow quiet hours, but 8:30am blasting music, and hooping and hollering into the night. Just. know that it is a popular park for large groups.
Based on other reviews here saying that it was quiet, I'm willing to give it another try in a different loop. Or, not in a tent but in a camper van which is my other option.