There's a certain area on Oahu that they return to every day to sun and there is also a place called the cleaning station. The turtles go there and the fish, whose species escapes me right know, anyway, they will clean the turtles of parasites, etc. Last year, spring break, we net snorkeling in this cleaning station area. However, there were no turtles getting cleaned, but we did see a couple just floating.
Can't wait to see more pics.