Can you believe my Dad has worked for Delta all my life and I was a flight attendant for Mesaba (Northwest Airlink) for 2 years and I've only ever been to Canada?!?!

Anyway, a friend and I will be going to Santiago and then heading over to Buenos Aries for the remainder of our 10 day trip. I am elated, however, I am looking for pointers on the cultural differences between the two (well, three.)

I read that in Buenos Aries, their dinner rush is at 10 PM and there are no liquor laws regarding "last call." I also read that most of the locals sip their drinks very slowly - no inebriation, just social chit-chat. What types of other things should I know about? I'd like to think that I can catch on to what the "vibe" is around me, but you never know. (I'm not a big drinker, by the way, but I'm glad I read that anyway.)

I speak zero Spanish so if there are any offensive hand gestures I should know about beforehand, that would be helpful, too! But anything that might seem odd to a newbie. Thank you...