Camped in Acadia National Park many many times....One of the most beautiful places in the country. Mountains surrounded by the ocean, incredible place. Always stayed at Blackwoods Campground in the park, love the sound of the surf crashing on the rocks at nite....and, there are one or two more campgrounds in the park, and many surrounding it.
Bar Harbor is a lovely little town too.
Actually took one entire 8th grade class camping in Acadia for 5 days in April. Was a middle school science teacher. Was quite a "field trip".
As far as lobster, all the lobster you can eat, fresh off the docks......!
I enjoy Acadia mostly in the fall and spring when its not crowded. Make sure, if you go there, to take route one from Portland up the coast to Acadia, lovely ports to see on the way. The highway is faster, but, you will miss the Maine coast, which is next to heaven, in my opinion.
Oh, the hiking in Acadia is wonderful, lots of well maintained trails.....even a trail leading right from Blackwoods up the south face (ocean facing) of Cadillac Mountain, the biggest in Acadia and the entire Mt. Desert Island. Took the eighth graders on that hike, crazy day, was 92 degrees that day in Bangor, set a record. Then the kids wanted to go swimming in Eagle or Echo lake, forget which one.. Ice hadn't been out for long, so they didn't stay in the water for long ! haha, great memories