All hotels have spas now, but farms? Along the California coast, hoteliers are taking advantage of the year-round good weather, planting their own fruit, vegetable and herb gardens--all organic, of course. Some of the best:MARK HOPKINS HOTEL: Overlooking the entire San Francisco Bay, the rooftop garden includes wild blackberries, Meyer lemons, chamomile (for the hotel's tea creme brulee) and purple sage, to be used in Thanksgiving stuffing. markhopkins.net; rooms cost $355 to $4,000 a night.MEADOWOOD: The Napa Valley resort's one-acre garden has a flower bed (blooms adorn the guest rooms), old-growth walnut, apple and fig trees, and a newly planted olive grove. meadowood.com; $425 to $3,585 a night.BACARA: The Santa Barbara hotel boasts a 1,000-acre ranch. You'll find 300 acres of Hass avocados and 100 acres of Lisbon and Meyer lemons--used in its signature spa treatment: an avocado-citrus body wrap. bacararesort.com; $395 to $5,000 a night.