The launch point is generally where gliders both launch and land. They will land on both sides of the bus, and are pretty quiet. If you need to cross the airfield, you should ask someone, until you know how the airfield operates enough to get safely across yourself. Gliders will normally circuit around the airfield to land, but they can approach from anywhere in some circumstances. You should check that there are no gliders on approach to land before you cross the field.
If you are half way across the field and you notice a glider landing, stand still. The pilot will have seen you, and there is nothing worse than trying to avoid someone who is running around trying to avoid you! That said, if it is too late for the pilot to do anything, or it still looks like they are flying towards you, get out of the way quickly!
When driving on the airfield, the same rules apply - you should always check for gliders and planes landing before crossing the landing area. Aircraft always have right of way over ground vehicles, even aircraft moving around on the ground.
Although gliders will normally land at the launch point, they can land anywhere on the field, so you should keep a good lookout wherever on the field you are.
As well as winch launching, we also aerotow at Cranwell, using a powered aircraft, and operate a motorglider. Both of these have propellers on the front, which you should stay well clear of when they are operating. Never hang anything off a propeller on the ground, or attempt to spin it, as it may start if the controls in the cockpit have been left in the wrong position.