Hmmmm....many favorites, lots of places I want to go but I haven't.
1. Favorites--this is tough...several favorites, for different reasons.
The mountains of Colorado, esp. around the Breckenridge area and down around Silverton and Durango. Great get away close to home.
Northern California, San Francisco itself, the coast from SF down to Big Sur, the Mendocino coast to the north, and the Napa Valley/Sonoma County area. A favorite long-weekend getaway of mine, great driver's roads away from the city, scenery, food.
Oahu and Maui.
Eastern Ohio...where I'm originally from... not much dining wise and culturally, but the backroads of Tuscarawas, Coshocton, Carroll, Holmes, etc counties are incredible for driving...
For big-city experiences, besides SF, my favorites are San Diego, LA,Chicago, and Boston.
2. Haven't been to but want to go:
Pacific Northwest....I've been to Portland and the surrounding area a few times, but I want to explore Seattle, Puget Sound, the Washington coast, the Cascades, Crater Lake, Snowqualamie.
Big Island of Hawaii, Kauai, Lihue
Alaska
More of Arizona..I know the Phoenix metro area quite well, and have been to Sedona, Jerome, Flagstaff, and the Grand Canyon, but I want to explore the rest of the state.
More national parks...I've seen all the ones in Colorado, but I want to explore those in Utah, Wyoming, South Dakota.
Blue Ridge Mountains, Smoky Mountains. Have passed through long ago but want to go back and explore..heard there are a lot of great driver's roads there.
3. Outside the US.
I've been to Mexico, Canada, England, France, Italy, Switzerland, but want to travel more extensively throughout Europe (more of England, Ireland, Scotland, Wales, Spain, Germany, in particular).
Australia, New Zealand, Hong Kong, China, Brasil and Argentina are all on my to-do list for the next decade or so.