A short climb up through Christchurch Adventure Park to views over the Canterbury Plains and Lyttelton Harbour. You can return the way you came but we descended on the gondola, which is free in that direction. Mostly pines trees and gorse to look at, but not a bad way to stretch the legs and the views form up top are good.
Here’s more information on Christchurch Adventure Park, which is popular with mountain bikers as you can take the gondola up and bike down. There’s only one track up the hillside (the Uphill Track), which starts at the main car park. There is a shorter loop track in the valley also. Info on these walks here.