Head left at the fork as soon as you go in. If you're getting a locker, get one in the bay immediately before Maku Puihi - this is the central location. Hit the aqua coaster first, then drop slides, then Honu. If you can get these as "ride now" status or short TapuTapu waits, you have conquered the park. Everything else is gravy after that. Ohno and Ohya sometimes get high, so do that next.
The Kunuku Boat Bar is a great place to get a drink during waits - it has a table facing the tube slides so it is fantastic for people watching!