Maine is a very SMALL state. There is a little bit of stuff and a lot of NOTHING.
Must do's;
Kennebunkport. Give it a day, maybe two. Watching the tide come in from the brewery deck, Federal Jacks, is amazing. Stay anywhere, eat lobster roll from anywhere including the gas stations. Don't let them talk about the 'BEST' lobster roll. There is no BEST. They are ALL freaking fabulous. Some add lettuce and mayo. Others are 'purists'.
Cape Porpoise, Cape Pier chowdah house, Pier 77 (next door) O'reillys lobster pound in Cape Porpoise (coolest place, evah, say hello to Mike)
Portland. Have not been there and regret it. Festivals, on the water, everyone says fun town. Eat lobster roll.
Go up the coast on Rt 1, stop wherever. Rockport, Bath. Eat lobster roll.
Bah Habah Gotta go to the top of Cadillac Mt. Bar Harbor is easy worth a weekend. Most beautiful place on the planet. Eat lobster roll.
If you wanna see 'the rest of Maine' go up I95 for 6 million miles and roam around Milinocket. Go up Katahdin.
Don't believe this crap about Maine being 'buggy'. That's a load of crap. It is so far beyond 'buggy' it's not even funny. It's insane buggy, eat you alive, black fly, horse fly skeeters.
Winter ends June 1. Summer is July 12. Fall starts around the 13th, 4:40pm or so. Winter usually starts September 1-ish. Do NOT got the last week in July. Canada is off that week and they INVADE the Union.
Maine is wicked awesome. Except for the bugs.