I'd suggest white chocolate macadamia cookies but it sounds like macadamias are already covered. How about this:
COCONUT PECAN SQUARES
Crust:
1/2 cup butter
1/2 cup dark brown sugar (packed)
1 cup flour.

Cream butter w/brown sugar & add flour. Mix well.
Press mixture into a greased 8x8" pan, spreading dough evenly into the corners. Bake in a preheated 350° oven for 20 minutes.

Topping:
2 eggs
1 cup light brown sugar (packed)
1 cup coarsely chopped pecans
1/2 cup coconut, mixed with 2 TBL flour
1 tsp vanilla
Dash of salt
Powdered sugar

Beat eggs well. Add brown sugar & beat until thick. Stir in pecans & coconut. Add vanilla & salt. Mix well. Spread over crust. Bake at 350° for 20 minutes or until well browned. Sprinkle with powdered sugar & cool. Cut into 1" squares.~~Bound to Please

PINEAPPLE BLUEBERRY COBBLER
1 fresh pineapple
1 1/2 cups fresh blueberries
1 1/2 cups sugar
1 cup self-rising flour
1 cup milk
1 stick butter, melted
1 tsp cinnamon, ground
1/4 tsp ground ginger
1/8 tsp ground nutmeg

Peel, core & cut up pineapple into bite-sized chunks. Add to fresh blueberries. Sprinkle 3/4 cup sugar over fruit & then mix together. Set fruit mixture aside. In a large bowl, mix flour, 3/4 cup sugar, spices & milk. Place melted butter in 2 qt pan. Pour flour mixture over butter. Place sweetened fruit mix over flour mixture. Bake in a preheated 350° oven for about 1 hour or until brown. Can be served with whipped cream or ice cream.~~Kitchen Miracles

How about this: TROPICAL CITRUS CAKE

1 box yellow cake mix
1 small can mandarin oranges, including juice
1 cup egg beaters
1/4 cup applesauce
Beat 30 second on low then 2 minutes on medium. Pour into greased 13x9 pan and bake at 350 degrees for approx. 25-30 minutes - let cool completely then frost with topping.

TOPPING:
1 (15oz) can crushed pineapples
1 (8oz) container lite cool whip
1 small pkg instant vanilla pudding.

Mix altogether & frost cake.

Have fun at your party!!!

I put on a Luau at our clubhouse last summer. For one of the desserts I made chocolate covered bananas on a stick! They were the hit of the day.
Following the directions for melting the chips in the microwave,(I used milk chocolate but semi-sweet is good also)-I kept the melted chocolate over a pot of warm water to keep it melted.
I cut my bananas in half-crossways (I had 160 at the luau) and rolled them in a mixture of OJ & lemon juice, drained & patted dry w/paper toweling. Have a cookie sheet(s) lined with parchment paper or waxed paper ready. Insert a wooden skewer in the cut end of the banana. Tilt the bowl of chocolate & dip the fruit, carefully spinning off the excess. I also crushed up macademia nuts & rolled them in those & place on cookie sheets. Place sheet in freezer until dessert time.
I also made Pineapple Upsidedown Cake, Hawaiian Rice pudding (added some coconut cream in w/the milk) & Fresh Fruit in a watermelon shell, and poured some vodka over it. Oh & I made banana cream pies.