Awesome! There are a lot of great condo rentals just outside the south gate of Yosemite!
Carmel is incredible but the cost of hotels is quite a bit higher than monteray which is about 15 minutes away at most. Carmel is worth it though! So much quieter. Walk to the end of the main road and go to the fabulous beach. For a great steak try Oceanside. Do 17 mile drive as well. Try lunch at one of the golf courses. The whole area is famous for artichokes so eat them local if you get a chance.
If you are traveling on the coast a stop at Hearst Castle is a must. It is pure magic and the town, cambria, is lovely. Make sure you see the IMAX film before your tour. Totally worth it.
SF - my home town! If I were visiting I would stay in the fisherman's wharf area. Easy access to trollies, cable cars and ferries. No need for a car in SF unless you plan on doing day trips.
If you do a day trip than Sonoma is the best choice. Amazing wineries Benzinger, Gundlach Bunchu, Sebastiani and so on. Great plaza and food that is unreal. For about $30 you can get a day pass in to Sonoma Mission Inn spa. Most beautiful spa I have been to. The hot mineral water comes straight out of the ground below the hotel. It is rumored to have healing powers! If you want to splurge try Watsu massage which is Shiatzu in the water. Unreal and few places offer it.
Also just north of SF are some great hikes in the redwoods.
Too much to hen-peck on my iPad. Let me know if you want more info!