They have a 'show' that they perform at different stations representing each of the different sets of Pacific islands, i.e. Tahiti, Samoa, Tonga, etc. They do native dances, explain how to make native crafts, take pictures with the tourists, all in native garb. Pretty cool but know going in that it's a big money grab. It's expensive to get in and there are opportunities to buy stuff every time you turn around. I went once but probably wouldn't go twice. I have to say, though, it WAS kind of a cool experience.
If you do go, do the night Luau. They have big show and a guy comes out and twirls a fire torch. Pretty cool stuff.