Mexico - Three day trip to MEX with 15 year old! What to do?

In a few weeks I will be down in MEX for four days. I have been there before for business but never toured much. I want some advice from fellow FT'rs what would be appropriate for us.

Any help would be appreciated!
Thanks

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Enjoy the street Tacos!!

Here is a few of my favorites:

1. Wander the Zocalo area and see temples excavated and churches and government building built from ancient city stones
2. wander chapultepec
3. take the subway everywhere you go and discover aztec ruins that were excavated during the building of the subway and incorporated into the design
4. Museo Anthropologia
5. Teotehuacan
6. Xochomilco
7. frida kahlo and Coyocan
8. window shopping in Polanco on Mazeryk

that should keep you wanting more....enjoy

Boy or girl? Interests?
The new Museo de Arte Popular is fun for youngsters.

Girl. The two "F"

Loves fashion and fun! :)

A 15 y.o. girl likely would enjoy exploring Mexico's largest shopping mall, Centro Santa Fe (http://www.centrosantafe.com.mx/) - some 300 stores in there. If you don't want to make the trek out to Santa Fe, then along Avenida Insurgentes take her to Liverpool, one of Mexico's oldest department store chains.

Find a neighborhood tianguis (street market) where you'll find vendors selling everything such as "designer" clothing, toys, shoes, kitchen utensils, junk, food, etc. Ask at your hotel if they know if any tianguis nearby as they are usually only held once or twice a week. Be careful of pickpockets if you go to one but other than that you should be fine.

Teenagers seem to enjoy the Six Flags Mexico amusement park - locals may still refer to it by its original name "Reino Aventura". So if she's had her fill of museums and ruins you might consider an afternoon here.

Eat at sidewalk cafes and enjoy listening to the mariachi bands.

Depending where you are from, she may find the high-end shops in Polanco too similar to what there are at home. But the Polanco streets are nice to walk around and leafier than downtown. The big mall at Moliere has plenty of different stores to suit all tastes, or at the other end of Masaryk there's quite a large branch of Liverpool (I don't agree with the previous poster, who recommends heading to Santa Fe, it's hardly worth the schlep since there's nothing else that's fun unless she wants to look at high rise buildings and men in suits!)
Almost opposite Liverpool is a branch of Fishers, a popular sea food chain that is very family friendly and has the kind of glitzy decor that she might find fun. Get there a bit earlier than the usual Mexican lunch time (say around 2pm) and then enjoy seeing the middle-classes flooding in!
Go to the Chapultepec Park preferably on a weekend, to see a more proletarian crowd, also fun. Outside the anthropology museum, she'll be impressed I'm sure by the 'voladores'!

For fun, I would climb the pyramids at Teotihuacan, they are an incredible sight. Maybe spend a half day strolling the area around Zocalo.
For fashion, I would go window shopping in Polanco