There are a few "brewery drive" websites that are useful in planning.
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https://www.brewerydb.com/map?option=brewery-routes I used this one a lot in the past. It is in "reboot" process aka beta but might still be usable now (there are a few clunks and missing parts as of today)
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https://beermapping.com/beerroutes/
- well, the third one I have used is now closed
- Google Maps, search for breweries or brew pub
On your coastal south drive I would highly recommend the Firestone Walker in Paso Robles and Buellton. They also have a decent tap house in Venice but the area was kind of seedy.