That is so funny. I live in Hawaii as well and every year there is the Ko olina triathlon. Ko Olina is the name of the area Aulani is located in. Possible to do, will Disney do it who knows.
For those wanting a Disney triathlon they won't do it on property. The bacteria count in the lake is too high, USAT will not insure any races there. That's why Florida 70.3 also moved venues. So I would think twice about swimming in that lake.