Hadley/ Roundtop
Hadley is a nice mountain. If you want a longer hike, you can bushwack along the ridge from Hadley over to Roundtop. It is a relatively easy bushwack (a little over mile). Roundtop has nice open rock summit and you will most likely have it to yourself (Hadley can be crowded).
Spruce mountain has a fire tower with the bottom stairs missing. You can still climb it, but I would not consider it too safe. There are no views otherwise. The hike is short (about 1 mile one-way), but there is a maze of logging roads, and it is easy to make a wrong turn.