The Maya

Practice your Mayan math
http://www.mayaskies.org/mayamath.html
http://www.pbs.org/wgbh/nova/maya/glyp_wave.html

Mayan Gods

http://www.theancientweb.com/features/mexico/gods/
http://mythicjourneys.org/bigmyth/myths/english/2_maya_full.htm

The Ball Game

http://www.ballgame.org/

Cenotes

http://www.archaeology.org/interactive/cenotes/cenotes.html

General

http://www.mayankids.com/

Mayan Quiz

http://ngm.nationalgeographic.com/2007/08/maya-rise-fall/maya-quiz-interactive

Folktales

http://presentations.pppst.com/herotwins.ppt