A plug for an unpublicized local cross country ski area - The Nansen Ski Area in Berlin, it is a cross country ski area run by the oldest ski club in the country. Definitely not glitzy, a nice alternative to the local commercial areas. They tend to be very conservative in rating ther trails, great for families and beginners. It is a bit hard to find (although those who have found success pond road are on the right track).
Its worth visiting as this may be their last winter in their present location, as their site is on a corner of one of the proposed sites for the new federal prison.
On a completely different note, be aware that Barnes field is fairly close to a local snowmobile route, so winter solitude isnt guaranteed, although I suspect that with this bunch the snowmobilers will be the ones complaining about the noise!.