K.S.
My mom lives in Santa Rosa...
We spend lots of time at Bodega Bay or other beaches on the Sonoma Coast. Or there is the Russian River...You could also go to Armstrong Woods and hike (a short hike) and have a picnic. Also, there are many farms up there that welcome visitors to come and pet/feed animals or pick fruit like apples or berries (search the web for this). Have fun!!!