"You could go around the world a couple of times and struggle to find a course with all those elements," Charteris said.
Two new champions will be crowned following the feature 50km race, with last year's champions Andrius Ramonas (injured) and Annika Smail (work commitments) not competing.
Contenders to take out the major titles include Majell Backhausen (Australia) in the men's 50km race and Jo Johansen (Wellington), Fiona Hayvice (Wellington) and Lucy Bartholomew (Australia) in the women's 50km race.
Rotorua runner Hunt, 62, will not be gunning for any major titles but is looking forward to running the shorter 42km marathon distance.
Hunt, who has run long-distance events for about 30 years, said he really enjoyed running in the bush.
"I want to try and do the Tarawera 100km event next year and this is basically a good training run," he said.
"I did the 85km distance during the Tarawera Ultra in February and that was the furthest I've ever run in the bush."
Hunt has been trying to live without sugar during the past 18 months and said it made things a bit challenging when running.
"I just read a book way back called Sweet Poison and thought that was me," he said. "During the 85km event in February, it was probably harder because I had never run that far in a bush and I had been doing this sugar-free thing."
However, he was feeling confident ahead of the run.
"I'm running about 60km a week and am pretty confident I can do it in about five and a half or six hours."
The Tarawera Trail Marathon will retrace the reverse journey of the Tuhourangi people this weekend.
A carved trophy, carved by Te Puia's master carvers, will be awarded to the champions.