take it easy for a week. no jumps at all. if you must, ski, then stay fully centered the whole time, and leave your boots moderately tight, but not to the point of pain.
in about a week (depending on the severity of your condition) your shins will be back to normal, and you can ski again. once your shins are 100%, tighten the shit out of your boots every time you put them on. booster straps can help, but the only thing that prevents shin bang entirely is staying away from backseat landings on jumps.
remember: shin bang is a compounding injury, so if you stress your shins before they are fully healed, you can expect to add even more days to that one week recovery time.