Running all over the world.
Some good answers already. I'd say they're really missing out on Crissy Field in the Presidio of SF. In fact, I'd recommend you rent a motorized cart or bike from Pier 39 area and bike this and other areas mentioned... See More
Yosemite National Park in February. Gets me everytime. All waterfalls are full and roaring. And, at sunset you get the 'Firefall' effect on Horsetail Fall along with the most beautiful orange color on the face of Half Dome.... See More
Natural beauty is amazing. Drive CA-92 west to Half Moon Bay. If it's not too cold/wet/windy, consider a hike up the Sweeney Ridge trail from the Sneath Lane trailhead off CA-35. San Mateo it self has some parks with nice Bay... See More