Balboa Park is a must-visit destination in San Diego during the winter season. This urban park is home to numerous museums, gardens, and attractions. Explore the San Diego Zoo, which is located within Balboa Park and is known for its diverse collection of animals. Take a leisurely stroll through the beautiful gardens, such as the Japanese Friendship Garden or the Botanical Building. Enjoy the winter-themed events and exhibitions that often take place in the park during this time of year.