invitation: act like they just won a trip to a resort on an island. on the front of the invitation put something like: you just won... then on the inside at the top put a one night trip to your name island! this is in honor of your name's bithday!
decorations: make the party room look like the beach. add beach umbrellas, picnic blankets, beach chairs, and anything else beachy.
greeting: give each party guest at the beginning of the party a hawian lei and sunglasses. found at any party store.
craft: take string an either braid it or tie it knots to make an anklet. this crete an island look
flashlight limbo: you know how to play limbo(hopefully). instead of a bar play it with a flash light's light beam.
crazy hula: players stand in a circle.player1 does a crazy hula step. then everybody in the circle repeats it. then player2 (person to the left of player1) does step one then does her own step. everybody reapeats. player three does both player1's and player2's step then her own. this goes so on and so forth. when a person forgets or messes up they are out and the sequence starts over again. this goes on until one person is left. the person is the winner.
hula hoopa mania: this is simple. you just hoola hoop til you drop. last person left standing is the winner.
beachball: play volley ball with a beach ball. a gigantic one is the best. if you don't have a net who cares? just draw a line with chalk or tape.