You can smell Rotorua from a distance. Long before you see the city sign, the air is already thick with the distinctive scent of hydrogen sulphide – best compared to rotten eggs. This is the perfectly natural side effect of intense geothermal activity in the area. And yet, the stench doesn’t scare tourists away. Rotorua is one of the main tourist hubs on New Zealand’s North Island. It’s also jokingly called Roto-Vegas, thanks to its abundance of neon lights and bars. Other nicknames include Sulphur City and Rotten-rua and each of them reflects the specific atmosphere of this city. Geothermal features are everywhere. Rotorua sits right in the heart of…