Drink a butter beer (or pumpkin juice which is my favorite), enjoy the queue of FJ (you do not have to go on the ride), if you like photography take plenty of photos of everything, enjoy the few shops that are there, or check out The Lost Continent area. You can look at the little shops, grab a bite, or listen to the talking fountain. With Hagrid being one of the things they're doing, they'll be awhile so you could definitely see Poseidon's Fury too.