I really have so many to choose from it's hard for me to decide which is the best place to go! First it all has to do with location and then it has to do with the weather. If it's raining you want a back up location.
Most people will head to Minuteman national park and hit the old North Bridge, but I avoid it. There are SO many other places to hit up in the park, this is the last one I suggest.
I like the Amesbury Common. Its huge and has so much shade when the sun is just too much. It also has a lot of older trees that really have wonderful color!
Another location I hit up for Fall photos Blue HIll Reservation.
typically if I get stuck on a location, I try to find the distance between me and the client, and then find a unique place on google maps. It's so easy to look around with Satellite View and street view.
Don't get stuck just standing in front of a tree! There are so many ways to incorporate fall colors into your photos without just standing in front of a tree.
Location: Boston, MA.