Not sure if you want to come all the way out to CA, but if you do, I recommend Costanoa (
www.costanoa.com). It's like luxury camping. You can stay in the lodge, in a cabin, or tent cabins. There are several hikes that you can do right on the resort property and there's also a spa, so you can get massages and/or other treatments while you are there. The resort is right on the coast, you can walk to the Pacific ocean and there are trails with great views of the ocean. It isn't quite in the mountains, but there are hills. It is perfect for an outdoorsy vacation with a little luxury. It can get crowded on weekends, so I definitely recommend a mid-week trip if you can manage it.
There are also several state parks within easy driving distance if you want to get beyond the resort, including the Ano Nuevo State Reserve (
http://www.parks.ca.gov/default.asp?page_id=523) and Butano State Park (
http://www.parks.ca.gov/default.asp?page_id=536). Butano in particular is a great park, lots of trails that are all well-marked, and not as well known as other CA parks, so it isn't that crowded.
- Barbara