Blackwoods is one of only a couple of campgrounds in Acadia National Park, which doesn't allow backpacking. It's connected to the South Ridge Trail, which gives you the opportunity to hike to Cadillac Mountain directly from the campground; we did this for the sunrise on our last day, and HIGHLY recommend it! (See the last picture.)
Rangers consistently patrol the campground, even driving through a couple of times after quiet hours begin; I found this really helped keep the noise down, despite the number of campers. (The campground was sold out for the duration of our stay!)
Each campsite has a fire ring and a picnic table, and sites are spaced decently; I would've appreciated a bit more privacy and space, but I'm sure the tree cover varies based on the site. My friend, who stayed at B121, seemed to have a bit more vegetation between her site and the surrounding sites.
There are plenty of bathrooms throughout the campground, as well as taps with potable water. There is an ampitheatre which is used for nightly activities; I think it can be rented by groups, too. There are showers just outside the campground (8 quarters for 4 minutes; the water isn't always hot, though!) and you can also purchase wood at the shower facility.
One of the routes run by the FREE shuttle bus stops at Blackwoods every hour during the summer; using this shuttle, you can get to Sieur de Monts, Otter Cliff, and the Village Green, where you can connect to any other bus. This is awesome, because it means you don't have to waste half the day jockeying for parking!
Overall, I think Blackwoods Campground is a great value and a great place to camp while visiting Acadia.
A friend and I decided to camp here before a backpacking trip in the Whites, to cut down on morning-of driving time. Our site, #02 on Loop 2, was in very close proximity to all of the neighboring sites. We had children on several sides, and a rowdy group of adult men on another side. Quiet hours are supposed to start at 10:00pm, but our rowdy male neighbors were up, playing music, talking loudly, and singing, until midnight. Then, just when we thought they were ready to settle in, they turned on a headlamp aimed directly into our tent. We are both very experienced car campers and backcountry campers, but even we struggled to get any rest through all the noise and light. The staff drove by a few times in a golf cart but never stopped to encourage this group to quiet down or use a little etiquette/common sense with their headlamp use. It wouldn't have been so much of a problem if the sites weren't SO close to each other. I attached a photo to show just how closely all the sites are situated; that's my backpacking tent, for scale.
A friend and I stayed here for one night prior to a weekend of hiking in the Whites. Our site was clean and spacious, and it was great to be able to build a fire. There were lots of RVs around, but the peepers still drowned out the sound of the nearest generator, so that was OK by us.
The shelters at Hermit Lake are secluded, off-the-grid, and pristine. You may think, being off Tuckerman's Ravine, they would be noisy, but all of the tent platforms and lean-tos are removed from the trail, usually involving a rocky, steep, root-y descent from the caretaker cabin. We never heard passing hikers from our tent platforms (#2 and #3). The caretaker is friendly and knowledgeable; there is potable water in summer, and there are FLUSHING toilets. The lake is pretty, and there is tons of wildlife around, from birds to red squirrels to moose, who often go for a dip in the lake. There is also a bear locker near the tent platforms! When I called Pinkham Notch (twice), they weren't sure if there was a bear locker, so I hiked in a bear can, but there was in fact a locker.
Five friends and I decided to compete in Questival, which came to Boston for May 11-12, 2018. There aren't many campgrounds open in Massachusetts this early in the season, but Harold Parker State Forest was! I snagged a group campsite since we'd have four tents. We had to set up after dark, so we wound up congregating in one corner of the group site. When we woke up we could see just how HUGE the group site was! We had 4 two-person tents; you could easily fit 3x that number of tents. PLENTY of flat ground to set up on, and we were far enough back from the road that we never heard or saw other campers arriving, even though we know most other Questival competitors stayed at this campground. It was about a 5 minute walk to the bathrooms and showers, and potable water was available right on the site. Even though it was early in the season and not very leafy, we could only occasionally see our neighbors' headlamps. There were 4 or 5 fire pits, 5 large picnic tables, and 3 driveways that could fit two cars each. Great value for the cost! We were pleased with the privacy, space, cleanliness, and amenities.