Pinewoods is in Plymouth, MA. It is operated by the Country Dance and Song Society. Contact (blue clicky thing "www.cdss.org").
Pinewoods is very isolated and pleasantly rustic. Do not bring a radio, portable TV, or the Wall Street Journal! Rarely does anyone leave during the week. Everyone, including artists/instructors, caled staff, live in cabins. They run from 2 person cabins to about 12 person houses, with two person rooms. I think there are a few single rooms too.
Everyone is assigned (volunteers for) a small task like sweeping a dance pavillion, manning the book store, or clearing tables which usually takes 30 minutes to an hour per day. In addition to a full workshop schedule during the day, performances and dances at night, you can always find individuals or small groups jamming, learning, and sharing throughout the day and night in the woods, along the banks of the ponds, or in one of the many other cozy gathering places.
You'll love it.