Madonna Inn at 100 Madonna Road, San Luis Obispo, California.

If you haven't heard of the Madonna inn, Google it. Themed rooms show a bit of their age, but that's where the charm comes in. You probably only need one night but make sure to explore all of the hotel grounds to take it in. We stayed in the Kona room which is one of the rock/cave rooms. Highly recommend. The bathroom is totally integrated into the rock and lots of fun. Comfortable bed. And a fireplace!