Go for a hike! It's SO BEATIFUL. There is a trail access point walkable distance from Starr's house, or you can drive up the shore and start hiking from Gooseberry Falls or Tettegouche State Parks.
The best ice cream in town, in the heart of of Lincoln Park Craft District. There's lots of good stuff to buy, eat, and drink in that part of town.
Go play some board games!
As far as tourist traps go, it's a pretty fun one. Walk on the Lake Walk and watch massive ships come into the harbor. There's some fun shops, good resturants, and of course a brewery and distillery down there. (But you don't need to go to to Canal to find a microbrewery... just spin around anywhere in town and take three paces and you'll probaby end up infront of some kind of brewery.)