California, although I live here and not a full-timer but retired. I do RV/Camp year round.
With its
6 Temperate Zones you can pick what you want to see and do at any time of the year. Moving when you want a change of scenery or temperature.
Plus it has some of the Country's best natural wonders. As for the crowds. With planning or on a whim I have never had a problem going and doing what I want.