This is interesting. Not much to add that hasn't already been covered but just wanted to add my personal perspective.

I've visited Mexico City six times over the past four years and have always had a fantastic vacation. As others have said, there's so much to see and do - great culture, musuems, sights, restaurants etc etc. I've found the people friendly and helpful.

I speak a little Spanish and whilst I certainly don't look Mexican, I make an effort not to look too much like a tourist - no expensive camera round my neck, no big fold out maps etc etc. Basically, you just need to be aware and sensible - all the major things have been well covered in some of the earlier threads.

I've walked around Zona Rosa by myself late at night and not had any problems. The subway is cheap and very efficient and again I haven't had any problems. On occasions, hailed street cabs - utterly aware of the potential risk - but that was a risk I was prepared to take. As with life, everyone has different ideas of what risks they're prepared to take. Personally I find some of the replies reactionary and some verge on xenophobic. But, as I said, everyone makes their own choices.

For a really interesting, fun weekend with some friends I think Mexico City is a fantastic choice - you'll have a great time.