The only state I've ever visited is Florida, I went during the summer and it was way too hot and humid for my liking. The roller coasters and water slides were amazing though, and there was lightning every night which was cool to watch. I defnintely wouldn't want to live there though.
That's difficult to answer without knowing a little more. What time of year are you going? Will you be traveling alone, with other adults or with children? What do you like to do and what type of climate do you prefer? Do you need a place that has public transportation or will you have a car? Do you prefer big cities or more rural areas?
Susan621 I haven't specific date to go yet, but I hope it will be in a near future. I will be traveling with my partner and we prefer warm climate (we are from south) but don't care the weather it's not sunny if the experience it worth. We will need public transportation but it's good because of we'd love walk around US and don't miss anything! We like both of it, big cities and more rural areas. We love american culture so any choice will be good if lets us to know a little essence of united states