Travel By Car
The easiest and fastest way to visit craft breweries in San Diego County is by car. Public transportation in certain parts of the county is great, but because breweries are spread out far and wide most are not accessible by mass transit.
If you are coming to San Diego with your own car, you are all set. If not, you will need to rent one.
For tips on driving long distances to San Diego, check out this article from Condé Nast: How to Pack for a Cross-Country Road Trip.