We are hoping to spend 4 nights in Taupo next March. We are planning to spend one day in the Tongariro area - possibly including a flight over the volcanoes ( are there any reputable companies offering flights?). We also wish to visit the Waitomo caves and it seems that the only opportunity we will have is to go while we are staying in Taupo. Is this too big a day trip from Taupo? We will have our own vehicle.