Longboarders get ready for the Single Fin Mingle competition.

A competitor looks for a good wave at the Single Fin Mingle ...

A line-up of longboards on the grass at Sumner beach.

A competitor at the Single Fin Mingle shows off his moves.

Spectators watch the Single Fin Mingle competition from the ...

Sumner beach draws a crowd for a longboard competition.

Two friends surf together at the Single Fin Mingle Competition ...

Competitors at the Single Fin Mingle ride the waves.

A longboarder dives through the waves at the Single Fin Mingle ...

A longboarder shows off his moves at the Single Fin Mingle ...

Competitors high five during a longboard competition.

Long boarder prepares for a morning surf at Single Fin Mingle ...

Smiling surfer paddles out during the 2019 Single Fin Mingle ...

Surfer hanging five during the 2019 Single Fin Mingle festival ...

Surfing a long board at Single Fin Mingle Contest 2019 at ...

Long Boarding competitors at Single Fin Mingle 2019.

Long boards lining up on Sumner beach.

People fishing at the mouth of the Waimakariri River.

View of the Avon-Heathcote estuary from Sumner, showing Sumner ...