Among your first stops should be Tongariro National Park Whakapapa Visitor Centre. Here, you'll be able to find your bearings and get lots of useful information before you begin exploring.
When it comes to things to see and do in Whakapapa, Tongariro National Park Whakapapa Visitor Centre is a traveler favorite. And in good news for your budget, admission is free. Mt Ruapehu, Mt Tongariro and Te Porere Redoubt will add to your day out and are not far from the tourist information center.