Most important: site 50 is no longer an XL site. Evidently they changed numbers but it is not reflected on the Maine State Park reservation system. We stayed in site #33 which was nice and open with plenty of room between any other sites. Overall it is a nice park but there isn't much to do here unless you have a kayak or fish off the dock. There is no "town" (Ellsworth is about 10 minutes away) but you could make trips into Acadia from here, and it's probably 40 minute drive to Bar Harbor. If you are looking for freshwater to fill your tanks: you will need at least a 30-foot hose as the bathrooms (where the fresh water spigot is located) are about that far away from the road. Everything was really clean, although they always seemed to be mowing during the day. Otherwise, it is a very quiet park with lots of open lawn, picnic areas and a playground.
I stayed at Site A53. You get assigned your spot when you arrive: so make sure you error on the side of a longer spot when you make the reservation. All spots were very close to one another. You are basically sharing the picnic, fire pit with the person next to you. Generators are allowed, but discouraged (it says to use them "sparingly" during the day). If you have a large RV or trailer you will find that the spots are rather tight to pull into. You can do it, but it isn't the easiest even though they are pull-through sites. The main goal in the campground was to fit as many RV sites on the area as possible. All in all, this was a good campground serving as a base location for going out and doing stuff (the whole point in a national park anyway). Everything was very clean and well maintained. My only complaint was the smoke from the fires. Because of the evergreen trees and people burning wood that wasn't 100% dry: there was a lot of smoke. So much so that you didn't want to open your windows. Although I didn't have time, you should definitely check out the other campground area: Sea Wall. I would think it is a little nicer being that it is a first come, first serve (no reservations).
We stayed here 2 nights in site #41. It was an excellent pull-through site across from the bathrooms. We were worried about it being noisy next to the bathrooms, but you never even noticed. The sites in the field also looked nice if you were with other campers. This park was very quiet and extremely well maintained. Sites are generously spread out so that you have plenty of privacy. Easy to navigate the roads as well as the dump station with a big rig. The people at the entrance station were very nice and helpful. I would definitely stay here again. One of the best state park campgrounds I have ever stayed at. Ranger stays at the booth until 11:00 pm. However, if your an early-riser person: some of the gates (auto road, ocean side picnic area) don't open until 9:00 am.
Stayed in site #19. It was a good back in site and was level side to side but not front to back. Quiet hours started at 10 PM and generator hours were from 10 AM to 7 PM. This campground is much better suited for tents and very small RVs. All sites are very shaded reducing the breeze and also increasing the presence of mosquitoes. Most importantly, they had notices about their drinking water being contaminated on each of there spigots. NOT a good sign. Stayed one night: would not stay here again.
When I tried to make a reservation for 1 or 2 nights by phone, they wanted no part of it: telling me to call back a few days before arriving to see if there was room. This is not a nice looking park nor is it well maintained, even if you can walk to the beach (you can't see it and there is no direct access). Upon arriving, a very young woman told me I could follow a loop to view all the available sites. The only problem is you couldn't follow the full loop with a trailer or any other decent sized rig: the turns are way too tight. This resulted in me having to back up about 150 yards on a very narrow dirt road, almost getting stuck in the mud. As for the sites: they are not at all secluded, and are very small. There is basically room to park your RV and nothing else. They use wood chips in an attempt to mitigate the flooding when it rains (to no avail). There are about 25 sites with hookups: the rest are primitive and in the woods. About 10 of the sites with hookups were filled by seasonal or permanent guests (their trailers up on blocks). We left first thing the next morning. You should avoid this place unless you just need an overnight. Also, cash only and you pay more if you have "extra" guests. When I told them I had a child with us they wanted to know his age to see if they could charge me extra for him (an infant). As if $47 (cash only) wasn't enough???