As “Sonoma Coast” (as I’m sure you know given your ITB status) is perty big and considered by many to be too big a catch-all to be particularly meaningful, for purposes of your quest, I would focus on the following sub-divisions based upon geographic locale:
SEA RANCH TO CAZADERO CORRIDOR (including inner ridges to a point):
Representative wineries to visit: Peay, Hirsch, Martinelli (located on River Road in RRV but they have plantings out in Cazadero).
Wines to taste: Peay Scallop Shelf, Marcassin Estate, Martinelli Three Sisters, Hirsch Estate, Littorai Hirsch Vineyard, Siduri Hirsch Vineyard, Bjornstad Hellenthal Vineyard, W.H. Smith Hellenthal Vineyard
JENNER TO BODEGA BAY CORRIDOR (including inner ridges to a point):
Representative wineries to visit: Littorai, Freestone, Porter-Bass (actually on the edge of the RRV and technically within RRV but more akin to Sonoma Coast profile if you ask me), Red Car (they’re now out near Graton, don’t know if you can taste there yet, but they’ve shifted their paradigm towards Sonoma Coast sites, cooler sites, and starting in 2008, signficantly lower alc levels)
Wines to taste: Littorai’s own vineyard plantings, Littorai Thieriot Vineyard, Littorai Mays Canyon Pinot Noir, Porter-Bass Porter Bass Vineyard Pinot Noir, Scherrer Winery Platt Vineyard, Red Car Heaven and Earth, Red Car Platt Vineyard bottling, Radio-Coteau Terra Neuma, Ceritas Escarpa, Kistler Bodega Headlands Bottling,
Hope that helps and that you have a great time of it.