There is a map board in the car park. You'll notice that most of the trails are one way. The main trails going up are The Bender and Calorie Killer. Deviation is a good one to come down on. My favourite was Pamplona with some nice bendy action. ---
It's not a big mountain bike park so your choices are limited and you won't be lost for long but you can pick up a really nice map from the i-site (information centre) in Blenheim to keep in your pocket.