Ventana is very nice, secluded, and great service. Post Ranch in has amazing views, and some very unique room types. My wife and I stayed at Ventana for a few nights after we got married, and thought it was great. Very peaceful and relaxing. They have a nice wine/cheese reception each afternoon (not sure if they still do it) with the manager in the lobby which we enjoyed. They make a point to talk with you and tell you a bit about the area and the property. There's 2 pools: one is European style (clothing optional) and the other is swim suites required. Neither ever had many people in them any time we went in August. The restaurant is also very good. The setting is in the woods, back on the hill side of highway 1, and there aren't any ocean views.

The Post Ranch Inn would be my choice if I could do either, but you will pay a premium for it. Alternatively, you could stay at Ventana and then have dinner at the Post Ranch Inn. Also, you can go get a drink at the bar at Post Ranch without staying there (just tell them at the gate you are going to the bar). That way you can enjoy the setting and view, without paying the premium.