Things You'll Need
Instructions
Hop on the Mach Bike and head to the far southwest corner of the Safari Zone.
Ride up the steep muddy slope to access the northwest corner of the map. You cannot make it up this hill without the Mach Bike.
Head to the southeast corner of the map with the Acro Bike.
Run up the small set of stairs to the north and use the Acro Bike to ride the white rail into the northeastern corner of the map, which is otherwise off-limits.