5. San Diego Zoo (San Diego)
For more than a century, people have flocked to the San Diego Zoo to learn about animals that they’ve never seen before. A zoo visit includes a ride on the Skyfari Aerial Tram, guided bus tour, and many live-animal shows where you can find out about the creatures that make their home there. Upgrade your day with the addition of a small group, up-close experience with one of the park’s unique species.