I'd take an oxygen tank or a gas mask, it's like the worst air in the world... I think. Otherwise have a great time! A little old, but still scary Dirty Air down there...
I would explore the Zocalo area if I only had one day down there. Tour the government buildings, and take a look at the ruins that are right there in the corner of the quad. If you have time this evening, a tour of Xochimilco, the floating gardens, is really cool. If you had more time, the pyramids at Teotihuacan are just awesome, but outside of the city. Aside from that, try your best not to look too American (or German for that matter) to avoid the kidnappers....
Great advice, thanks! Well...I already survived Caracas...so Mexico City doesn't really scare me anymore .
SJC, man, how do you managed to spend so much time on this BBS while travelling? gee, you must have one eye looking at the scenery & the other looking at the computer screen... nevermind
If you have a night to party hit this place called Club, or the more trendy El Alebrije, they rock! Mexico city women are pretty hot.