Seeing artists at work in Sullivan Park is only one of Mexico City's many attractions.

Mexico City boasts a rich history and vibrant culture, and if you haven't been there it's easy to see what you're missing and start making plans for a vacation visit. Brush up on the city's layout with the maps at All About Mexico City -- allaboutmexicocity.com -- and take a look at "All About" under the "Index" heading or a quick profile of the city and some of the things to see and do. Be sure to read "Frequently Asked Questions" for information on such things as cellphones, and then browse their suggestions for activities, side trips and a brief directory of tour providers.

Another all-around guide is Guia Virtual de Mexico City -- mexicocity.com.mx -- whose overview of the city includes history and a list of some of the major feasts and holidays, with links to details on where some of the events are held. Be sure to browse through "Attractions" for descriptions of Chapultepec Forest and other major spots to see. If you're not booking a hotel through a local travel agent, they provide a directory arranged by area of the city.

You might be interested in the accommodations arranged on a scale from "very expensive" to "inexpensive" at -- wcities.com -- along with their detailed guide to city history and "Recommended Tours."

CASTLES AND CANALS

Click on "Visiting the City" for details on everything from castles and canals to outdoor recreation and things to amuse your kids.

Click on Mexico City on the map at Mexico Travel Guide -- go2mexico.com -- and read about landmarks including Chapultepec Park, or the Templo Mayor, the huge archaeological site that started with the discovery of a massive stone carving.

There's more detail on sights to see at Guide 2 Mexico -- guide2mexico.com -- along with tips on visiting Mexico. But some of the links will take you to pages only in Spanish.

Look for Mexico City at Fodor's online miniguides -- fodors.com/miniguides -- and check out their suggestions for five-day and 10-day visits, and side trips. Get your taste buds working by clicking on "La Cocina Mexicana." And you might want to delve into "Shopping" for tips on finding gifts, leatherwork and antiques.

If you have time, don't neglect the rest of the country. The Mexico Tourist Board -- visitmexico.com -- is full of details on spots ranging from Acapulco to Xalapa.