That really depends on what your interests are. Do you like to be in the city? Around the beach? In the mountains? What do you enjoy doing? Answers to those questions are going to determine where the best places for you to visit would be!
Go to New Hampshire! It's so pretty in the fall, and we endure all four seasons, so you can really see which season you like the most :) And also I'm here soooo you should come visit me.