SJS on "Summer jazz schools in New York"

I'm planning a US trip during my schools holiday period from 29 June - 10 August. It will be my first time to the states. I would like to visit New York, and thinking its a bit like Mecca for Muslims , every jazz musician should make the pilgrimage at least once in their life shouldn't they?
Can someone recommend or evaluate any of the summer jazz programs that are running during this time, either through direct experience or word on the street?
Cheers