September should be NICE; less crowded.
Ogunquit is nice---walk the quaint downtown, and the shoreline.
We used restaurant.com for Bintliffs, that was pretty good.
Drive to Portland, and walk the Old Port---eat somewhere there.
If you like baseball----perhaps get tickets to a Sea Dog game, pretty much every seat is a good one.
Are you a golfer? If so, use golfnow, and play Old Marsh in Wells (or google Harris Golf).
LL Bean is in Freeport.
Have FUN!!!
Pat