Got back yesterday from my Maine vacation so thanks to those for their recs and tips. Other than United Airlines delays, crappy customer service and lost luggage on the flight to Portland it was a great trip. Piss on you United, I'll gladly fly other airlines in the future.
We had a Airbnb rental in Cushing that was remote, right on the water with it's own dock, pretty much your typical Maine cottage. This was our base to go up and down Hwy.1 for day trips. Went sailing on Penobscot Bay out of Camden on the 4th on a classic schooner the Olad. For those who stated their love of old boats this is a perfect way to spend a few hours. Had time to eat/ drinks then catch the fireworks over the Camden Harbor. This would be a good place to spend a couple of days, really cool little town. Also did the hike up to Mt. Battie just outside of town in a state park. The view of the Camden Harbor was excellent. It was much warmer than I anticipated and I sweat out every Maine beer I drank during the hike.
Couldn't convince my daughter to do the nighttime luminating sea water kayak tour out of Castine , so we did the morning tour instead. It was fun, but nothing outstanding. Lunch at the Warf next door afterwards was plenty good though, with more Maine beers . This was a reoccurring theme, go do something outdoors related, then stumble on a great place for seafood and beers, repeat.
Made it to Acadia National Park on a rainy Friday , drove the one way loop around the park with lots of brief scenic overlooks until the rain stopped then hiked around one of the lakes. Drove to the top of the mountain and again, the views were awesome. Beautiful place with crowds that you would expect at a National Park, but nothing that wasn't manageable. Bar Harbor on a Friday was crazy crowded though, and I wasn't anticipating this. I figured it would be busy but it was a snarl of traffic and no where to park. Really wanted to spend some time there but after a half hour of looking for a place to park we gave up and went to a pub in Ellsworth.
Spent the last day of the trip in Portland before flying back to Austin. For the most part we hung out in the Old Port area and had a blast. So many cool places on every street and alley I could have spent a few days there just wandering aimlessly.
Flew back on American with no issues, so once again, screw you United.