Northwoods Outfitters
5 Lilly Bay Road, Greenville, ME
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Directions: Go in towards the checkout counter and head right, all the way back by the snowboards. There's an unsigned single occupancy bathroom (the only one I've ever used) and a male/female signed one beside it. The unsigned one has a small sink, a toilet and sometimes infrequently stocked supplies. It is the very definition of 'water closet'. Door lock and handle like in most houses.
Comments: These are probably the most used restrooms in town, as Northwoods Outfitters has a coffee shop in the front with free WiFi.