Keith Koffler has the story here:
Mrs. Obama has decided to jet out to Vail – instead of visiting slopes closer to Washington DC in Virginia or Pennsylvania – despite already incurring criticism for taking opulent excursions, particularly a trip last summer to Spain. There, she stayed at the country’s swankest [sic] hotel and, like this weekend, was traveling without her husband.
Rooms at her hotel start at $605 a night, and top out in excess of $2,000 a night.