We like the Saco River Campground in North Conway NH.
Great mountains, fresh air, tubing in mountain streams, good restaurants, cheap booze and no sales tax.
During the summer, on a sunny day, the weather is as close to perfect as you can get.
If only the approach roads from the north headed to North Conway were in better shape. I swore last year would be our last visit due to the terrible road conditions. Rough, narrow and no shoulders. My memory is short however as I was just looking at available dates to go again in July!
Bar Harbor Maine rates pretty high for us as well. We like Timberland Acres RV park in Trenton ME. The pull through sites are so big another rig could park behind us and we would not feel crowded.