The Crocodile track is mainly on pasture which gets grazed by cattle that also use the track in places.
It weaves its way down (or up - depending on your point of view!) the side of a steep gully for most of the way. There are lots of switchbacks - some of them steep, a few rocks, some bumps, some grade reversal, some fast interludes, some jumps and some exposure. There's quite a bit of fun for a skilled rider.
Strictly speaking the track starts (or ends!) at the top of Kennedy's Bush Road but it does carry on under another name to join up with the Kennedys Bush Track which in turn goes all the way up to the top of the Port Hills.
There is a branch at the bottom called C2 which starts (or ends!) at Halswell Quarry and joins the main Crocodile Track just above the bottom of the gully. C2 is really just an alternative (and better) track through the small pine forest that stands between the park and the pasture.
Text updated by jimcummings, 10 July 2015