All User-Generated Placemarks
Things get more interesting when you compare the distribution of placemarks for specific keywords. Unfortunately due to a technical glitch we do not have a map for the term Mardi Gras. But since a main element of the celebration in New Orleans is about processions, using the keyword "parade" provides a good sense of the distribution of activity on Mardi Gras with a large cluster in the French Quarter where the largest (and best known) parades occur.
But Mardi Gras is more than the French Quarter with neighborhood parades and celebrations being a key part of local identity. These events, known as "second lines", have a much different geography within New Orleans. Neighborhoods outside of the tourist district (such as Treme and Broadmoor) emerge as important (and non-tourist oriented) sites for Mardi Gras.
Other New Orleans cultural icons include mapping Beignets (clustered around the Cafe du Monde site) and Jazz. The map of jazz highlights both the French Quarter and the site of the annual jazz festival.
Some of most intriguing results are for the keywords "Hurricane" and "Katrina", each of which highlight parts of the city that were particularly hard hit in 2005. The Lower Ninth Ward neighborhood and the site of the levee break are particularly well documented.
Anyone interested in Hurricane Katrina and Google Maps should see:
Crutcher, M. and M. Zook (2009). Placemarks and Waterlines: Racialized Cyberscapes in Post Katrina Google Earth. GeoForum 40(4): 523-534.
Map of New Orleans Neighborhoods (to orientate yourself)