Rather than ride into the park on snowmobiles from the town of West Yellowstone, we opted for a trip on a historic yellow snow coach -- kind of a small, boxy heated bus on tracks that were first used 50 years ago.
In one of the coolest car customizations we've seen, an engineer retrofitted a 1966 VW bus with snowmobile tracks, creating an all-terrain party wagon that can tear through snow at an impressive 30 MPH.