What’s a great vacation spot in U.S. for a family with kids?

2 adults
1 thirteen year old
and 1 six year old.

A nice relaxing vacation is what we are looking for. we’ve been to nice places like the smoky mountains (where we got a nice cabin) we really enjoyed it. We also went to Disney World and that was a lot of fun! We aren’t the theme park type family we just enjoyed disney world becuz the six year old loves Disney princesses! so something nice and relaxing. A beach maybe? or something like Smoky Mountains