Definitely eat at New World Cafe and get the blackened string beans.
The Bear (I think that's the name...) is also really good.
If you like hiking, climb Overlook Mountain. The trail starts at the buddhist monastery.
Visit the Woodstock animal sanctuary!! We took the kids to a really wonderful park located at the elementary school in woodstock. Bread alone is yummy too!! How about day trip to New Paltz. There is a great place to eat called Karma Road (vegetarian), you could also hike at mohonk mountain when in New Paltz. Have Fun!!!