Tiki Party HELP!

Hey guys, I have a small get together friday night. I'm thinking of making it tiki-themed.

What I need is some suggestions. I particularily need some kind of recipe for Shrimp! Maybe just how to make a good sauce to go over grilled shrimp. Any and all ideas are welcome... Also, does anyone know how I can make Orgeat syrup (how much almond extract should I mix with the sugar water, etc).

I've got an awesome recipe for grilled shrimp. I used to make these when I was stationed outside Savannah when we could buy shrimp right off the boat.
The marinade is:
1 medium onion, diced
4 cloves garlic, minced
1/2 cup vegetable or olive oil
1/4 cup (give or take) lemon juice
3 tablespoons soy sauce
2 teaspoons ground ginger
Marinade the shrimp 2-3 hours in the fridge, stirring to coat. Skewer and grill over medium-hot grill 3-4 minutes on each side, or until they turn pink.

SB:

Where were you @ Savannah? Ft. Stewart? Hunter? CG Station?

I work at the Airport in SAV now--lived here about 2 years.

Scott