Okay, I have to be honest, I thought that this was going to probably end up being lame. I was so wrong though. My boyfriend and I had the best time ever.
We did it on Cinco de Mayo. We went to 4 different clubs. At the first bar/club we met at they provided us with tickets to get free shots from the bar. From there we literally just went club hopping. Never had to wait outside more than 5 minutes outside each club which was really nice because there were definitely lines and cover charges everywhere.
This particular club crawl we went to Analog > Omnia > Sidebar > Fluxx. We stopped early, but it continued on.
I would do this again next time I go to San Diego honestly. Just for the mere fact that we could walk right into all the clubs was really nice.