D3 Super Camp Basketball Officials Referee Referees Official
I attended this camp at University of Richmond couple summers ago. I found it to be a good skills development camp and would be a good first camp for someone who has some 3-person experience.
I thought it was well organized - a good balance of classroom discussion/feedback and games. They taught a very specific style/philosophy on positioning that they wanted used in the conferences they assign. I found the philosophy interesting personally but it may not translate to what your HS assignors want.
There was a bit too much of a good ol' boy club feel for me personally -- a lot of the officials there were repeat campers hoping to get noticed by the camp directors. I got the impression that attending multiple years was pretty much expected if you wanted to be part of the club.