The campaign aimed to get people riding bicycles or walking to work and school for 50 days between January 17 and August 7.
The campaign was also about promoting a reduction in greenhouse gas emissions.
“Essentially we were advocating for a healthy environment and people in our 50th anniversary year and beyond,” said Climate Change Cook Islands director Ana Tiraa.
Registration forms to sign up for the challenge and a score card to keep track of the days people ride or walk to work were given out at the start of the campaign.
Participants who started the cycling campaign back in mid-January had to hand in their completed 50450 Score Cards last week.
The cards were then put into a draw, with the winner receiving a brand new Avanti Metro from Ride Rarotonga in Panama.
Middleton says she is very excited to have won the competition.
“The whole campaign was brilliant, and I really enjoyed taking part.”
Middleton says she only recently took up cycling with her husband, a teacher at Tereora College, and their two friends.
She is part of a group that cycles around the island twice a week, and says it is the best way to see the island.
“I rode on the runway, and that was amazing. It was just really cool.
We also did the dress-up ride around Rarotonga which was fantastic too,” Middleton says.
She adds that it’s been really good to see everyone out on their bikes, including all the children who took part.
Climate Change Cook Islands, Ride Rarotonga and the Te Ipukarea Society would like to thank everyone who took part in the campaign.