This side mission is triggered by entering the Jetski located behind the film studio on Prawn Island. The player must complete 8 course and each course must be completed under a certain time. Upon completion of each course, the next course is unlocked. The player is rewarded with $2500 and the Wetsuit outfit is unlocked after all the courses are passed.
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The name of the side mission is a sexual reference. "Watersports" is an alternate terminology for urolagnia, a sexual fetish for urination.