On Yer Bike operate 4WD quad biking adventures on a series of muddy tracks just north of Greymouth. There are several courses where you can drive a 4WD quad bike and there are also tours where you ride a 15-passenger Hot Tracks vehicle, which is similar to vehicles used in Antarctic bases.
The most popular options are the one and two-hour drive-yourself quad biking, particularly the two-hour Bush ‘n’ Bog tour where you’re virtually guaranteed to get covered in mud. On Yer Bike supply wet weather gear which is fairly effective at keeping your clothes clean.