Among locals to meet Mr Key were Dr Andrew Burton, who is the aquaculture manager at the park, and his 7-year-old son Angus.
Dressed in Mexican costume, Angus managed a discussion with Mr Key on the pros and cons of Mexican food, with Mr Key revealing he liked his Mexican "really spicy" along with a penchant for refried beans.
"I bet when you are a big boy you'll eat more of that stuff," Mr Key told Angus.
Dr Burton shared his family's story of fleeing Mexico after threats of extortion and told Mr Key he wanted to see a closer relationship with Mexico.
After the visit, Dr Burton said he was impressed with Mr Key and that there was a lot riding on the election for his family depending on the outcome.
He and his family have been back in New Zealand for two years, and Dr Burton said if Mr Key wasn't re-elected, they'd leave.
Dr Burton said he believed National's plans for a brighter future were important and said the other leaders didn't have the same understanding of international relationships as Mr Key did.
Mr Key also spoke with a group of local geothermal and business representatives, including Enterprise Great Lake Taupo general manager Fritz Frohlke, about the economy and the importance of geothermal to Taupo.
Mr Key said Taupo was considered a very important part of the New Zealand tourism sector because it had "so many things that are attractive".
He was pleased to hear the town had done well during the Rugby World Cup.