Balboa Park isn't just a park; it's a massive cultural hub, even larger than Central Park in New York. The Spanish and Moorish architecture, particularly the Casa del Prado and the Botanical Building, makes you feel like you are walking through Madrid or Seville. There are 17 museums here, including the free Timken Museum of Art, and if you spent just two hours in each, it would take you over 34 hours to see them all. Don't miss the Spreckels Organ Pavilion, which was the largest outdoor organ in the world.
In Old Town San Diego, the birthplace of California, you can step into adobe homes from the 1800s like the Casa de Estudillo. The Mexican heritage is vibrant here; definitely stop by Fiesta de Reyes for incredible food and mariachi music.
Finally, the USS Midway Museum is an absolute must-see. This massive aircraft carrier is longer than three football fields and carried over 100 aircraft. Walking through the hangar deck, the tight sleeping quarters below deck, and up to the flight deck where fighter jets are staged gives you an incredible appreciation for the thousands of sailors who lived and worked on this floating city.