"It's a place we will never forget. Even now I would love to go back and do it all again. Thank you for allowing us to come and be part of the celebration," Mr Brown said.
Gail Harrison, from the Whanganui Learning Centre, welcomed the group to continue using the centre.
"Language is the key to us all, and your first language is so important," she said.
Jayson Herewini spoke of his work supporting Pacific Island youth into jobs. Another visitor had come to return support shown to a Cook Islands group at Porangahau.
Organiser Teena Lawrence hopes the celebration will strengthen a new trust and lead to more Cook Islands culture and activities. She said everybody had a really good time but she wanted more young people.
"Pretty much all our elders were there. The young Cook Islands people we are still trying to reach. We will have to have a celebrity, or a cool sports day, next time."
Guest Esther Pilato wants to get involved, but doesn't have much time.
She said her father was born on Aitutaki but came to New Zealand with his parents at the age of 7. He was encouraged to learn English, lost his Cooks Islands Māori, and had to relearn it in later life.
Miss Pilato is also learning the language, as well as studying midwifery through Otago Polytechnic. She said she had been to the Cook Islands several times as an adult and she and son Joshua, 12, loved the relaxed lifestyle.
"As soon as I stepped off the plane I felt like it was home. I absolutely loved it, and want to go back and work there eventually," she said.
Ms Lawrence is offering Cook Islands workshops in language, craft and tracing family trees. Some will be available, for free, during Adult Learners' Week in September.
Interested people can contact her on 021 1125 813.