Salt lake city is the closest. Take I-94 south to I-80. Go west on I-80 until you hit I-15. Take I-15 north for about half an hour and arrive in Park City, UT. There will be signs to the three area resorts.
Alternatively, you can take 80 to 215 and follow signs for the cottonwood canyon resorts.
No, I did not use any mapping software to write this.