I was doing a roadtrip around USA for three months, and the first side of the country was California. Me and my boyfriend did the Highway One, from Los Angeles to San Francisco.
We've heard a lot of good things about this small city called San Luís Obispo, and everything was right! The place is so charming, calm and young. A lot of people on the street in the middle of the day, the fun Bubble Gum Alley, Powell's Sweet Shoppe (go to feel like a kid. really!) and with a fast search we found a lot of great restaurants and bars. We decided to go to Eureka!Burger and it was amazing! They have homemade beer and a few different ones, really good food and this amazing (and incredible good looking) Mac and Cheese. A great way to experience the city in a few hours.
But,if you can, i suggest that you stay at least 24 hours! :)