How to make sea races appear in GTA V?

I'm nearing 100% completion and have only the sea races to complete (with the 1 motorcycle race). I've completed the mission "Hood Safari" and have tried hopping on the in-game version of the jet ski (as Franklin) to see if that helps, but they still don't show.

Solution 1:

In order to see Speedophile races, you need to be on a Speedophile Seashark jet ski and you need to have finished "Hood Safari." In order to participate in Street Races, you must have finished the Strangers and Freaks mission, "Shift Work," and you need to be playing as Franklin.

Looks like you've done that. A similar question was posted to the Rockstar Support, here is Rockstar Games reply:

We are looking into a few reports about this now. If you would like to receive an email notification as soon as there is more information about a potential fix, please log into the Support Site and click Subscribe at the top of this page.