I've not been to that many states. But here are some I've been too:

Rhode Island - Super sucks, except for Newport. I really REALLY hate Rhode Island.
Connecticut - It's too bad. It's pretty nice.
New Jersey - It's not that a bad place. It's nice in some parts.
Pennsylvania - I liked Philly a lot! It seemed pretty nice. But I heard it's really rural in other parts. I don't know if I'd like it outside of the city areas.
Delaware - I didn't like it
Maryland - I really didn't like it. DC is a terrifying place.
Virginia - It was really deserted and a little creepy, the part I was in. There were no houses for miles on the highway, until there was just this one rickety old house in the middle of nowhere. Kings Dominion was cool though. I never heard so many southern accents in my life there.

Oh! I've been to Massachusetts, technically. But the part I was in was so like Rhode Island (it was only about 10 miles from the border between the two) that I didn't get a good impression. It seemed pretty nice though. More lively than RI.

Those are the only states that I've been to, besides New York, which I live in. New York, to me, is uncontested as the best. There's so much stuff to do all around, and lots of life, even in places outside of NYC like Long Island. Lots of personality. People in downstate New York, at the very least, are nothing like the stereotype of nasty new yorkers - we're friendly people, if not a little fast-paced.

I think I'd like California a lot, except that I can't tolerate heat above 80 degrees with a strong breeze. When I visit Cali, I bet it'll be up there with NY to me. Isn't it supposed to be full of hills and mountains there, like Ireland? I'd really like that.