honestly I'd almost forget about Kittery, its at the very Southeast corner of Maine right against Portsmouth New Hampshire which has a small 15 mile Atlantic coastline. Very rich area with Kennebunk, Ogunquit, Wells, York Maine along with Rye Dover New Hampshire etc. pretty exclusive expensive area . As someone said Kittery is a shopping paradise for all these exclusive folks, every mall outlet store you could possibly imagine. not really the Maine you are thinking of, picture one of those giant jersey mall outlet places right close to the Atlantic Ocean. If you really want to be along the ocean there are opportunities available simply because many of the Beach "hey day" are structurally old. You could find this in Hampton Beach New Hampshire, old orchard Beach Maine etc. the land is incredibly valuable, but lots of places needing rehab very bad due to the fact they were built in 50s, short season though & very expensive real estate.
Like I said, if coastline isn't a necessity, check along (ski 93) area along Interstate 93 New Hampshire, this area is exploding with growth. Lakes fishing hunting hiking camping, skiing snow mobiling, and don't forget leaf watching, incredibly this generates huge tourism. North Conway is already built up, good place for you to visit and observ the growth. Lincoln New Hampshire nice area.
Lakes region of New Hampshire & Maine is huge, as I said with gigantic tourism covering all 4 seasons. If I remember correctly bars stay open relatively late in Maine, most towns are aware that's how they make their money through tourism dollars.
Good luck, I believe sportsaholic is from Maine is you stumbled across him here. Bl itz is from New Hampshire I think.