It's different for each of the schools that has it.
We had INFORM at GT...it involved me looking like an a$$ and getting yelled at. But I learned:
1) How out of shape I was. (Got picked up by the van...better than getting run over by the van I guess)
2) My right from my left. (Midshipman-Candidate...CORRECT YOURSELF!)
3) My own personal limits of other people laughing at me. (suprisingly liberal)
We went from Atlanta to Kings Bay to tour a SSBN, to Mayport to tour and board the mighty DDG 963, USS Spruance and then to a speech given by then CNO Jay Johnson at NAS Cecil Field, Jacksonville. It lasted 7 days. I was glad to get back to Atlanta.
You will not have as much fun at VMI or the Citadel. You will probably have more fun in any California School. It all depends.
Good luck and try to keep a smile on your face...not when the DIs are in it though...
~D