We spent a pleasant afternoon at the Central Maine Botanical Gardens while I was in Maine. If you're in the Boothbay Harbor area, I highly recommend it. Be sure and carve out at least an afternoon, if not a whole day. It's huge and there are beautiful surprises everywhere!
(This was the coolest maze. It had smooth stones going from biggest to smallest and we walked it in our bare feet. It was uncomfortable at first but soon the round stones, heated by the sun, worked their magic and when we finished it felt like we'd just had a foot massage. )
And everywhere you looked...