Make sure your son visits Worcester and the Clark campus. While the campus itself is fine, the surrounding neighborhood is sketchy. Check the crime rate for the Main South neighborhood.
I worked for a grant project housed at Clark (grant recipients were Clark faculty) for three years. I was impressed with the faculty and grad students with whom I worked.
That being said, if your son is the type who is looking for entertainment in the local area–movie theaters, interesting eateries, music, etc. Worcester doesnt offer much especially compared to Saratoga Springs and Skidmore. When it comes to theater, Skimore has a strong program that is well respected in the theater world.
Also, Worcester is 45 miles from Boston–it is not just a quick bus/train ride away. Getting to Boston from Worcester is at least an hour trip each way.