Cannon Point Trig is a walking trail in the Akatarawa Forest, north of Upper Hutt, with a zig-zag climb through native bush to a summit that the listing says has a trig. The trail page describes the Cannon Point Walkway as a route to the historic Birchville Dam, and gives the walk to the dam as an intermediate-level trail. From the summit there are views over the Hutt Valley. The trail then continues along old forestry roads and descends to Birchville Dam, which was built in 1929 and supplied water to Upper Hutt until 1954.
The trail can be started or finished at Tulsa Park or Bridge Road in Upper Hutt, and there are regular bus and train services to Upper Hutt. Tulsa Park has a water fountain and benches. Dogs are welcome in most areas but must be under control, and they must be on a lead through the southern part of the walkway, which crosses private land. Bikes are not allowed on the Bridge Road to Birchville Dam section.