My plan is to drop stuff on a couple loungers under and umbrella on main beach in front of volcano. Then plan to head left, hit oh ya/oh no, go through the volcano and hit krakatau, then honu. I'll probably hit the serpentine drop slides right after that.
I think the key thing will be to ride everything you can- sans taniwha tubes- and then when you're able to tap, tap something with a decent wait (coaster, honu, drop slide), and then go enjoy taniwha tubes and/or the rivers. Once those start getting crowded, go eat before the rush hits.
Then head out once it gets unbearable and go ride Gringotts
I haven't been yet- but I've planned it out based on everything I've read.