As seen in the 2017 film: Smurfs the lost village. Smurfs actually enjoy a mix of skateboarding and snowboarding on trees (Kind of like how kids my age enjoy skateboarding) now we must remember if you try to attempt please wear a helmet because this is a dangerous sport. Okay now that that's out of the way i think the best item to use for this is a waxed skateboard deck (like the smurf one (LEFT) That sells for 50 dollars) or maybe a snowboard. I think that with proper protection you should be able to smurfboard down a hill safely with minimal risk of being severely injured (unless your balance is horrible)