Mathlinks is a 3-week residential math summer program based in San Diego, CA for students age 11-18. Valentin Vornicu is the director. There are three levels of difficulty based on campers' skill level. The daily schedule starts at 7am with breakfast and ends at 11pm with lights out, with classes from 8:15-11:45am and seminar from 2pm - 4pm. There are recreational trips on the weekends. The tuition is $3600 in 2014.
You can find more information on the website here: http://mathlinks.us/