What a great idea! Except for how when you fall you could stab yourself on various piece of road filth.
Pictures about "skiing"
Oh, that's how a ski lift works. Seems complicated.
Soviet Ski Racers
This pregnant woman should probably cover up unless she wants her baby to die. Wait a second... is this Photoshopped!?
Talons and a beak are old and busted. Knives are the new hotness
Time to ski-doodle
What is going on!?
In This Picture: Photo of superheroes water skiing
In This Picture: Photo of person with cool ski mask
If this is a problem they are having, I dont think a sign is going to eradicate it.