If you drive long the aqueduct you can park at Lake Ohau, which is great for a dull day as it has a low level path around the lake shore suitable for both biking (we did this on the previous trip to a nice lodge for lunch) and walking.
Although lesser known on the tourist trail, it is worth a visit if you have a spare day as it has a stunning backdrop, and is otherwise pretty quiet, so nice if you are tired of the crowds.
Wrapped up warm in layers, daddy & daughter enjoy the view.