To make the sugar syrup you need to boil sugar and water together in a ratio of 1:3 sugar to water, and boil in until it thickens to a runny syrup consistency. Store in a jar for all future cocktail making. It pretty much lasts forever.
Cut open the coconut, or if you are lucky enough to live in a country that sells fresh coconut water in a bottle, measure one cup. Add the strawberries, sugar syrup and rum and blend with a blender.