Trying to plan warm weather December vacation...any ideas?

[Sam3]

Tucson AZ. Or many parts of Arizona, the Grand Canyon and Petrified Forest are in the north, Sedona is mid north. Further south around Tucson there is the Sonora Desert museum, slightly southeast is Tombstone.

:edit:

Any of the National Parks. California has the Redwoods, Yosemite and more.