Jamaics State Park is close (within a 1/2 hour.) It is pretty cheap for a day pass (I think maybe $3 a person or something) and they have some great hiking trails that are pretty easy. They also have swimiing in the West River. It is really nice there.
Hildene in Manchester is a nice place to visit. It is the family home of the Lincoln family (Robert Todd Lincoln, son of Abe). Beautiful vistas and a gorgeous formal garden out back.
The Outlets in Manchester are widely spaced throughout the town. Not easy to walk around and shop.
I would suggest taking a look at Restaurant.com. They have some places on the site within the area. We went to the Manchester Bar and Grille on Depot St. I was a little afraid when we first walked in, because it look like a dive, but the food was really good. There were other places on the listing as well.