ANAHEIM (CBS) — The happiest place on earth will be the sweatiest place on earth this Sunday, Sept. 4 as athletes compete in the 2011 Disneyland Half Marathon.

The race, which begins with festivities hosted by the “Price Is Right’s” Drew Carey, starts at 6 a.m.

More than 20,500 runners are expected to participate including “Rules of Engagement” star Megyn Price, Capt. Ivan Castro, an active duty soldier who lost his eyesight five years ago in an attack in Iraq, and Whitney Henderson, a 24-year-old woman who is running across America and completing her journey by running the Disneyland Half Marathon.

Runners will go on their 13.1-mile journey through Disneyland and California Adventure. Runners will pass by the Matterhorn, through Sleeping Beauty Castle and alongside California Screamin Roller Coaster before hitting the streets of Anaheim and running through Angel Stadium of Anaheim amid hundreds of spectators.

In addition to the half marathon, other weekend events include the “Star Tours’’ Family Fun Run 5K, Kids’ Races and a Health and Fitness Expo.

This is the 6th year for the Disneyland Half Marathon.