We have a three-day stand-down period where we look at the science that comes in from GNS and then we will make a decision alongside our partners, Ngati Kaero ki Tongariro, as to when tracks will be partially or fully re-opened, he says. But in an area known for its volcanic activity, the international publicity from an eruption can be helpful -- provided it doesn't go on too long. "For now we're in the spotlight, and sometimes that can turn out to be a positive," Visit Ruapehu general manager Mike Smith says. "If it's short term, which we all hope it is, then these things have a funny way of working out in a positive way. If it's longer term, and particularly over a number of weeks, then it's more challenging." Some tourist operators have lost a few bookings due to the Tongariro Crossing's closure, but there have been people dropping by the region whose curiosity was sparked by the eruption. Mr Smith says the big wish for summer is that the crossing can re-open. "Many people put the Tongariro Crossing on their New Zealand bucket lists. It's one of the best one-day walks in the world," he says. "At some stage, we're hopeful they can still do the walk." Geologists have also warned of the potential for an eruption on Mt Ruapehu, which has impacted on guided climbs to the crater lake -- less popular than the Tongariro Crossing -- but not other activity on the mountain. Department of