Climb up Red Crater
If you look closely, you can see the line of hikers snaking up and down the trail on the right-hand rim of Red Crater. The highpoint on the rim is the highpoint of the Alpine Crossing (assuming one doesn't take the side trip to the top of Mt Tongariro).
This image is from the presentation "Lake Taupo, Rotorua, Hawke's Bay and Tongariro - Middle Earth Meander - New Zealand 2016".

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