Rich,
If you go out on saturday and there are alot of classes, try going to the bus and theres a line on the front left side of the bus that goes off to an old rock crusher. Usually students don't go out there. If they are, there's another line N/E off the rock crusher that will take you out towards the back side of the quarry, i've never seen any students out there, and the vis usually picks up. Also you could try taking a 040 deg compass nav off the front right side of the bus. This will take you to a wooden platform. Theres a line off the platform that goes north west I believe, it will take you to a deep boat at about 55 ft. I think there is a line off the deep boat that does a circuit, I don't know if the line is still there. You may know all this, but if you don't it's a good way to explore a little more of the quarry and get out of the way of the classes.
jim