We have been to Trapp Family Lodge several times (we used to live in Burlington VT). When you trade with II you do not stay in the main building but in the chalets located on the hillside. The decor is not anything that will stun you but, it gives you that mountain retreat feeling. The livingroom has a lovely inset woodstove (with unlimited wood available outside). The pool is basic but, the kids love it. They have movies every night at the main lodge. They have seasonal activities for the kids (ex/ maple sugaring, kids day camp, etc...). And if you are lucky enough to go when they have snow, they have x-country skis & snow shoes for rental.
All said it is one of our favorite places to go with our II trades (never traded points for it though).