Hey I'm having a luau for my birthday party too. I'm stuck on what to do for entertainment too, but I figured my friends and me could just play limbo and eat pineapple and stuff. If you're really good friends, you should be able to just talk and have a good time and something will come up. Maybe you can even have a luau bonfire. The whole party doesn't have to be entirely tropical stuff. You could watch movies too and do things you normally would do at a party. Maybe you can rent tapes and teach everyone how to hula, or make up your own hula dance.