1) Look for ladybugs. Millions of them. They over-winter along Stream Trail in Redwood Regional Park. I cannot confirm that they're already there, but I recommend that you go and let me know. More information and directions here.
2) Go to the beach. When the inland valleys - like Walnut Creek and Santa Rosa - are cold in the winter, the temps at the beach can be quite warm. It's a great time of year to walk Tennessee Valley or explore Limantour Beach or find your spot south of Half Moon Bay.
3) Walk up a creek. Because at this time of year, there's actually water in the creeks! We did this 3 mile loop on the north side of Mount Diablo recently. Sunol Regional Wilderness is probably stunning right now. Or go explore your local creek. The Bay Area has so many creeks feeding the bay, even some that haven't been covered in concrete.
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