WASHINGTON (AP) — Some lucky Girl Scouts are getting the ultimate experience in camping: spending the night sleeping in tents pitched on the White House South Lawn.

Michelle Obama is hosting Tuesday's campout as part of Let's Move, her initiative against childhood obesity. "Let's Move Outside" promotes taking advantage of the outdoors.

Fifty fourth-grade Girl Scouts from councils in Maryland, West Virginia, Virginia, the District of Columbia and Oklahoma have been invited.

They will climb rock walls, tie knots, pitch tents and participate in orienteering exercises to earn a new Girls' Choice Outdoor badge.

Astronaut Cady Coleman will join them after dark for star-gazing led by NASA staff and scientists before the girls call it a night.