If you can't find Coconut Syrup you can make your own.

Add 1 cup water and 1 cup Sugar to a pan and bring to a boil stirring occasionally. Allow to boil for 3-5 minutes.

Remove from heat and add coconut flavor.

Allow to cool.

cut lime into quarter lime wedges.

In a large glass (approx 24 oz) fill half way with ice.

Add coconut syrup and squeeze 2 lime wedges over ice.

Toss squeezed limes into glass.

Add Coke.

Add 1-2 tablespoons of half & half or cream and serve. Note that lime juice will tend to try and curdle the cream.