When traveling in Mexico City and stay at H or the Camino Real--the 110 currency hair dryer, etc works? If not, does hotel supply converter? Does Camino Real supply hair dryer?

120 volts, same plug config as US, no adapter needed.

Magellan's site has a nifty section for worldwide voltages as well as other info.

http://www.magellans.com/guides/world-guide.html

If its not in the room, you can ask for one from Housekeeping.