You didn't have shin splints, you had either bruised your shins, or you had destroyed your dorsiflexors by skiing and landing backseat al day. If it's the latter, then you wouldn't want to publicly admit that. The same muscle group (dorsiflexors) are injured by backseat landings, and shin splints, although they are different injuries. One happens from running, one from skiing with lame form. If you ski backseat, then try to ski more forward and see if that fixes it. If you have good form, then look into boots with a better spine or a 45 degree angle buckle that keeps the heel locked in place. These two things are helpful in reducing strain on your dorsiflexors. Try Full-Tilts, Dabellos, or Nordicas.
If the issue is shinbang, then make sure your boots are not too big, the liner is not to packed out, and that it is not loose at the top/without a powerstrap.
Credentials: last year I was getting shin bang, looked this stuff up, I am also a very injury prone distance runner.