Which wineries in Santa Rosa, Ca are a must try?

My family is coming to visit me in Santa Rosa, Ca (april 1st-10th, so its rainy right now, no bike tours please) and I'm trying to decide which wineries we should try right now...there are about 400 wineries surrounding Santa Rosa...obviously we aren't going to be able to try them all. Which wineries are an absolute must try? our wine preferences....I like full body red wines (I'm also beginning to develope a love for a good and dry chardonnay) my dad enjoys the same, my mom prefers sweeter wines, and my aunt likes merlots and pinot noir....please help!