If you view eating as an experience, you can't skip Tio's Tacos when visiting Riverside. The owner and artist, Martin Sanchez, has been expanding the exhibit for ten years, using old appliances, scrap metal, glass, children's dolls, utensils and an unfathomable collection of found items. Go for the fast-casual Mexican food. Stay for the huge collection of folk art.
If you're staying overnight, The Mission Inn Hotel & Spa is the place to be. The rooms have been preserved and decorated to maintain their historic character (over a century old) and you can also enjoy award-winning dining at the Inn's restaurants while you stay.