Buck Creek is really easy to find. Drive south on 191 from Big Sky, pull into the parking lot just south of the Corral Bar. Be sure to get there around 8:30 am. You can't miss it, it's the lot that looks like they are having a Metallica concert on the hill. Be sure to bring chains, you may have to baja out of the lot because there are about 100 trucks parked in it in no particular order. Also, make sure you bring a video camera so you can capture all the hilarious antics of the parking lot cowboys racing their sleds as fast as possible from end to end while giving you the stinkeye as you try not to stare. Don't bring earplugs, you will want to hear the glorious rumble of the aftermarket silencers that register just a shade over 200 decibels.
Then, make sure to check your six every ten seconds on the trail to the hill just in case one of the afforementioned cowboys is in a hurry to get to his super secret spot and needs to pass you. Another thing, when you ride the trail, make sure to approach all corners with reckless abandon and take them wide and fast! Oh yeah, and when you get stuck, make sure to summon every available soul to your current location, no matter what! Ahhh yes, Buck Creek...awesome.
Sorry, had an interesting day.