Our good friends sent their son, then a Junior, to the Stanford summer program last year. The report back from the boy was that it was a ton of fun and he really enjoyed the campus. Various field trips to Fed/State buildings (he plans to be a lawyer) were included. The boy is a top student, perfect ACT score (one of 5 in the county), outer space high SAT and a GPA approaching 5.0. He maxed out of Math as a freshman in H.S. and all classes are AP or Honors types. No sports at all but he does some community service work and is on ASB. Not sure if attending applies grease to any admissions cogs but I'm sure it can't hurt. The parents were sure proud!
Oh and yes the family is Korean.