Dancing until someone says, “whoa, how is it after 2am?” is one of the best ways to experience the nightlife of Old San Juan, and La Factoria is where you should do it. There are six different bars inside, and each has its own menu and plays different music, including a dancehall that has live salsa on Sundays and Mondays. Start at the front, take a shot of tequila, and explore them all until it’s way past your bedtime.