Any vacation spots where you do not need a car???

My boyfriend and I are looking to go on vacation any where from late September to mid/late October; however, we’re trying to find a place where we won’t have to rent a car. We’re from Boston and we’re trying to get out of the New England region for a week or so…

We like to stay pretty busy, so some place with a lot of things to do would be great. Any suggestions would be helpful!! Thanks!!!