Hussong's Cantina on Avenida Ruiz in Ensenada opened in 1892 and is the oldest bar in Baja California. It is a straightforward place — a long wooden bar, sawdust on the floor, live norteño music on weekends, and a clientele that mixes Mexican locals with Californian expats, surfers, and the occasional tourist who wandered in from the cruise ships.
The bar claims to be the birthplace of the margarita, and while the claim is contested, the cocktails are good enough that it doesn't matter. The atmosphere is genuine rather than tourist-staged — Hussong's was a real local bar long before Ensenada became a day trip from San Diego, and it feels that way. Open daily from mid-morning.