Everyone likes tropical cocktails! That's why implementing them in a fun game/contest at your Hawaiian luau is a great idea.
You should also get a few prizes for the contest winners... maybe another cocktail?:)
The biggest problem with this game is that most people don't really know a lot of cocktails. You can do a few fun things to get everyone ready. One great idea is to throw a simple cocktail mixing class before the contest. This way everyone will have a bunch of fun first mixing and then tasting the cocktails.
Since you probably don't know how to make cocktails either, unless you are a bartender, and professional bartenders are expensive, here are a few simple and fun cocktails that you can learn to make:
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