Visiting 10 San Diegan breweries in 48 hours isn't a great idea any way you cut it: at best, you'll only have a brief amount of time to enjoy the magnificent creations of the hardworking craftspeople in one of the greatest beer towns on Earth; at worst, you'll throw up. A lot.
But if you're like me, and have an insatiable thirst for west coast beer with only a limited amount of time to drink, then you don't worry about "bad ideas," "recommendations," or "health." And you'll benefit from my research.
Below is an outline of how I managed to cram 10 breweries into 48 hours, and what I discovered along the way. This isn't the only way to do it, but by following my lead (and this master map), you'll stand a good chance of not dying.