Marina Green San Francisco

You're heading to a sprawling waterfront arts campus right on the San Francisco Bay with killer views of the Golden Gate Bridge and Alcatraz—it's free to explore and there's always something happening, whether that's galleries, performances, film screenings, or just wandering around the green spaces. The whole vibe is pretty chill with tons of cafes and shops scattered throughout, so you could easily spend a few hours there without any plans.