So, I'm going to Mexico

A few friends from Colorado are coming out to go to SeaWorld so of course this weekend I am hopping down to San Diego to visit. My husband figures, hey, why not leave early and go to TJ for a few hours while we’re down that way? I’ve never been to a whole other country before and it would be cool to me. Not to mention, I’d really like to go clothes shopping down there.

So what else should I do in the few hours I have there besides go shopping and smoke a Cohiba? Anything I should worry about or look out for?