The 38-year-old Full House star took the image-sharing site Saturday to post a photo from her relaxing day at the beach.
"Mama got in the water today," she captioned a photo of herself holding a boogie board in a colorful tankini.
Cameron's photo comes on the heels of the Instagram announcement that she is working on her third book.
"Preparing to write my next book! Can't wait to share it with you all soon!" she wrote on Instagram Friday.
The actress' first book Reshaping It All: Motivation for Physical and Spiritual Fitness was published in 2011 and her second title, Balancing It All: My Story of Juggling Priorities and Purpose came out in January 2014.