Hong Kong Disneyland's Big Grizzly Mountain Runaway Mine Cars is basically Big Thunder Mountain 2.0--a backwards- and forwards-running roller coaster with launches, animatronic characters, Wild West wilderness, and plenty of fun thrills.  Set out in the park's western frontier, this attraction is a fantastic mix of storytelling and adrenaline.  It also zips throughout this themed land, crossing geysers and forests and rocky mountains.  It may not technically be the "wildest ride in the wilderness," but it's a solid rush indeed!