Spanning 100 acres in Balboa Park, the San Diego Zoo is not only one of the largest zoos in the country, it's also home to one of the largest collections of rare and endangered animals in the ...

This roughly 2-mile out-and-back walk follows a section of the bikeway, passing by the San Diego Bay National Wildlife Refuge in Imperial Beach.

U.S. News Insider Tip: Leave your car in one of the parking lots and take the free Balboa Park Tram that runs every 10 to 15 minutes to get around. Save money with a Balboa Park Explorer Pass ...