La Jolla Mom
Admission at the Botanical Building in Balboa Park is always free! It houses over 2100 tropical plants and palms and is great for picnics.
The San Diego Model Railroad Museum entry fee is donation-based. If you’re unable to contribute, you can still enter to enjoy the model trains and their ornate displays.
The Flying Leatherneck Museum is the only museum in the world that primarily showcases the United States Marine Corps (USMC) aviation. You’ll be able to take an up-close look at 48 historical aircraft in their gallery.
On the first Wednesday of every month, members of the San Diego Astronomy Association set up telescopes in front of the Fleet Center building for free public sky viewing.