dieting and going to the gym is very good, keep with it...

i've always needed to add some activity that was recreational as well because jogging or lifting weights can be boring; something to be occupied with while out of the house

kayaking might be good if you have a garage to store your boat in---certainly plenty of rivers and lakes in Mass that you can go paddleing in--and its not very expensive;

other things like frisbee golf, motor dirtbiking, fourwheeling, or archery might be things to take up that involve some fun and get you outdoors