Given the pools are off limits to day guests, I'd just walk through the lagoons, wander around the pool area to see it, grab a shave ice by Rainbow Reef or a meal at Ulu Cafe or Off the Hook. You can also walk past the Four Seasons to the "secret" beach.
Also, spend some time in the lobby checking out all the Hawaiian art and artifacts.
There are DVC model villas in both buildings, down by the pool area, so you could pop in to tour a 1 bedroom as well.