It's wonderful to have great friends, especially ones with vacation homes!
A family friend recently lent the kids and I their cabin on Hemlock mountain, what an amazing retreat! Close enough to the city that you can be settled within a few hours of leaving home but rustic enough to help you feel that you are away from it all.
Hemlock is a quieter mountain, not as commercial or busy as some of the other local mountains, but still has lots to do. I am told there is excellent skiing for any of you that enjoy that, however, I look like an uncoordinated elephant on skis so I will pass on that activity! For the less brave (me) there are fantastic toboggan hills, nature walks to explore the area, and a friendly local pub. I myself am a golfer and I would love to visit in the summer to play a round on the local golf course.
If you are looking for a cozy, nearby, charming weekend retreat, take a look at Valley View on Hemlock mountain, I highly recommend it for families or as a couples get away.