You would never believe California was in a drought for the past 5 years based on all the rain we have been getting this winter. I've heard some people complaining that all this weather is keeping them inside, and that they are going stir crazy.
Here's a great winter day idea. Go check out the waterfall at Sugarloaf State Park in Kenwood. This little creek is generally just a trickle, and is dry in the summer. It's a 15 minute drive from Santa Rosa, and a 1/4 mile hike on the "Waterfall Trail"