The monthly openings can be pretty crowded as you can see from these pictures, but lots of fun.
It's a forty five minute drive from downtown Portland on Rte 302, on the left. Open daily in the summer & fall it scales back it's hours in the winter months.
Hole In The Wall / Studioworks tel. 207-665-4952
Another fun thing to do a little farther up the road is to take a ride on the "Songo River Queen II", a replica of an 1800s Mississippi paddle wheel riverboat which operates on Long Lake, Brandy Pond and the Songo River. It docks on the causeway in Naples, where you can find a bite to eat.