In these tough economic times who would send their 13 year old and her friends to Mexico without parents especially to stay at some swank resort. Most of use couldn't afford the gas to take our kids on a family vacation let alone to Mexico. This is just more of Maria Antoinette Obams's let the starving peasants eat cake.
I figure with Secret Service, planing, logistics, sending advanced teams Secrete Service to sweep the hotels of bugs, bombs, etc., (They basically have to rent out the entire hotel or the top 3 floors, to maintain adequate security), armored vehicles for transportation around Mexico, helicopters for aerial surveillance, medical doctors must be flown in to accompany the young dignitaries, special food, chefs, to make sure no one is poisoned and on an on and on and on.
Mexico loves Obama!