I have a family so i would take 3 weeks off, i'd pack up, and go on a long road trip(CA. Nevada, Arizona, New Mexico, Utah, Colorado, Idaho, & Oregon)
places i'd want to see:
Start in S.F. go down Hwy 1(South)
San Diego
Vegas
Hoover Dam(AZ)
Grand Canyon(AZ)
Petrified Forest(AZ)
Meteor Nation Park(AZ)
Carlsbad Caverns(NM)
Bryce Canyon(UT)
Zion National Park(UT)
Mesa Verde(CO)
YellowStone(ID/MT/WY)
Crater Lake(OR)
I'd stop by all the big cities on the way.