That depends. If you're decently good at shooting, I like The Firing Line, which is up 145 past Whitehall. If you're heading on 145 north, it's the first left after you pass the junction with 329. You then make the first right, and go all the way up the hill, and it's on the right. It's combined with a fitness center. I don't know when they open, but they run until about 8PM on weekdays and 3PM on weekends. The only catch is that the owner is very strict about staying on the target, and operating the gun in a safe manner, as it's an indoor range. But, as long as all your shots hit your target, and you keep the gun pointed down range at all times, you won't have any problems. It's also relatively inexpensive... I don't know exact prices, but for a friend of mine and I to rent a lane for an hour, including rental of a Kimber Target, many targets, two boxes of .44 Magnum ammo (for my revolver), and two boxes of .45, it comes out to around $100.
As for outdoor ranges, I'm a member of Tri-Boro sportsman's club in Northampton, but I don't think they're accepting anymore new members. I don't know of any other outdoor ranges in the area, but just because I never looked.