I spent a month with J. Robinson in Minnesota (a long time ago!) and it remains one of the defining experiences of my life.

http://www.jrobinsonwrestlingcamps.com/wrestling/

This camp is especially useful for wrestlers that need to work on the physicality aspect of wrestling - you will leave in much better shape than you started Needless to say it is also a test of mental toughness.

It also has great technique, though...