Kupe is a great chief born in Hawaiki (Tahiti), and his parapara and whaea were from Rangiatea and Rarotonga, and that's where Kupe's power extended to.
In October 1882, Kupe found New Zealand floating on the ocean! So he anchored his boat in Hokianga Harbour to walk on New Zealand and see its beautiful nature!
Kupe found New Zealand because he and his village was having trouble with their food. So Kupe went out to sea to help his village and find food fort hem to survive.
Kupe found New Zealand in the Tasman sea, placed in the middle of the Pacific Ocean can be found! Apparently, to Google New Zealand was also one of the last lands to be settled by our kind/humans.
According to Google, Kupe went out with his fishermen, nets, fishing hooks and lines to their traditional fishing grounds to gather more fish for food!
Kupe went out to fish for some food for his village so that they can have more food, and on the way, while going past the reef I'm pretty sure they found New Zealand!
This isn’t really a physical challenge he faced, but it was an emotional challenge. But apparently in the “orthodox” version of the story of Kupe, he left his cousin named Hoturapa, to drown while they went on a fishing expedition, and he kidnapped his wife named Kuramarotini and with her, they fled off in her great canoe to Matawhourua.
I'm not sure anyone knows how Kupe died, but someone could've killed him if they hated him and they could've taken his place and be the leader, and also rule over the three islands