"It was so cool! It was a bit freaky with all those people, but I really enjoyed it,'' says Sahara.
Sahara, who is undergoing leukaemia treatment, recently met her idol Taylor Swift thanks to Make-A-Wish New Zealand.
Proceeds from the 42,000 participants who officially registered for today's event will go to Make-A-Wish New Zealand, Child Cancer Foundation, Garden to Table Trust, Fairfax First Books and Kidz First Childrens Hospital.
After the event, crowds headed to more than 600 barbecue sites at Madills Farm and Glover Park for food, drink and entertainment.
Event spokeswoman, Sandra King, says over 80% of entrants were part of a team.
"Teams ranged from four to 1200,'' she said.
Weather conditions were fine for the race, with cloud cover and slight drizzle later in the morning helping to cool off the athletes.
The Round the Bays event was established by the Auckland Joggers Club in 1972 with the inaugural event attracting 1200 participants.