Have been going to North of Highland every summer for about 30 yrs now - first with my parents, now with my wife and kids. Needless to say, I like the place a lot. BUT, you should understand what it's all about. It is not a wilderness experience. It is nothing like the primitive state campgrounds in NH or anywhere else. You can't have a campfire. You will see several other campsites from the entrance to your tent. What keeps me coming back? 1. Extremely well kept. Owners keep everything ridiculously clean. 2. Owners are good, reasonable people. 3. People generally respect boundaries. Yeah, there are a lot of people in a small space, but you won't find people blaring music, driving fast, or peeing on the edge of your campsite. 4. Owners don't tolerate ANY of the things described in 3. 5. EXCELLENT location. National Seashore within walking distance. 6. Quiet hours start at 10:30 and are strictly enforced. 7. Nice clubhouse with ping pong tables and Foosball. Not something I usually look for in a camping experience, but I can tell you that when my brother and I were little we loved having something to do when it rained for several days in a row.
I recommend it strongly for what it is. Just understand what it is. For what it's worth, my wife and I stayed at a KOA several summers ago when we drove across the country. First and last time I did that.
Reservations are very difficult to get. And in peak season you have to reserve a whole week. But I have some secrets that I'll give out if you pm me.