Pre-heat oven to 350 degrees.
Mix cake according to box directions and pour into a 13" x 9" cake pan.
In a medium mixing bowl, with an electric mixer, beat cream cheese and butter together until smooth, beat in powdered sugar until well combined.
Stir in coconut and white chocolate chips.
Dollop onto cake batter by tablespoonfuls about an inch apart.
With a knife or spatula, swirl cream cheese mixture around to create marbling.
Bake for 25-30 minutes or until a wooden pick inserted comes out clean.
While cake is cooling prepare chocolate sauce.
In a microwave safe bowl, combine chocolate chips, white chips, and half-and-half.
Microwave in 30 second intervals, stirring in between until chips are melted and well combined.
Slice cake and serve with about two tablespoons of chocolate sauce, whipped cream and a strawberry.