I'm planning a mid-April trip to San Francisco, and hope to spend 4-5 days north of the city hiking, eating and tasting wines. Initial thoughts are to spend a night or two in Sonoma, and another couple of nights in Healdburg/Russian River area. How do these locations compare with other Napa, Sonoma or Mendocino locales? Any suggestions as to "don't miss" chow destinations? Thanks.