In a large bowl, combine biscuit mix and brown sugar. Cut in 2 tablespoons butter until mixture resembles coarse crumbs. Stir in pina colada mix just until moistened. Fold in mango.
Turn onto a floured surface; knead 10 times. Pat into a 9-in. x 7-in. rectangle. Cut into 10 rectangles; separate rectangles and place on a greased baking sheet. Melt remaining butter; brush over scones.
Bake at 400° for 12 minutes. Sprinkle with coconut and nuts; bake 2-4 minutes longer or until golden brown. Serve warm.