If you were mid-50's and planning a week-long vacation in the contiguous USA - where would you go?

Trying to think of places for my parents to take their vacation. They like to go to busy places where they can walk around and do/see a lot. They live in San Diego, so SoCal is out. Time share in Vegas since I was in middle school, so that's old news. They went to Seattle a couple years ago and LOVED it. They're currently thinking New Orleans, but I feel like there's probably a city on the East Coast they would love - I just have zero knowledge of East Coast happening cities. NYC is probably a little too much for them, and I doubt DC would interest them much... That's about it for my knowledge.