The safety conscious pair also wore life jackets over their bathing suits as Alessandra used her arm muscles to steer the board around the water.
The 5'10" beauty also donned a brightly coloured bikini underneath her vest, which displayed her very slender figure.
Meanwhile, Anja dipped her toes in the water as she enjoyed the fun water ride.
At one point Alessandra became a little uneasy on her feet and the board nearly flipped, but the doting mother put a protective hand on her little one who managed to keep her balance.
Earlier in the day, the gorgeous family were seen frolicking on the beach.
Pairing her bikini with a black trilby hat featuring pink trim, Alessandra looked like she had just stepped off a catwalk as she strutted down the sand.
With her flat stomach, toned abs and endlessly long legs, it was hard to believe that she had ever been pregnant with the two adorable children - Anja and 15-month Noah - who played along side her.
The family are currently in the popular resort area in the northeast of Ambrosio's homeland, which has been voted Best Brazilian Beach eight times in a row by Voyage & Tourism Brazilian magazine.
So far throughout her trip, Alessandra has shared some happy updates and snaps of her getaway with friends and fans.
The holiday spot wasn't far for Alessandra to get to, as she had previously been working in Medellin, Columbia, at Colombia Moda, the South American country's largest fashion fair.
While she was excited to let her hair down with her family, Ambrosio expressed her sadness at leaving the neighbouring country. 'Last day in Colombia. It's been so much fun working here. can't wait to come back again!' she wrote before jetting off to Brazil.
When she is not busy being a full-time mum or a world renown model, the exotic beauty is trying her hand at writing. Her blog, simply called A by A, gives a behind-the-scenes look at her collection Alé by Alessandra, as well as fashion tips from the model.
Earlier this year she said of her fashion venture: 'I know what I like and what I want to see. I want to be satisfied just as much as the customer.
'I'm creating a brand that's everything that I am passionate about and have experience in, from growing up in Brazil, traveling around the world and moving here five years ago.'
Gorgeous: The supermodel kept her fans updated with Tweets and photographs


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