Preheat a grill for medium heat cooking. Very lightly oil the cake slices with cooking spray, then grill until browned and marked, 1 to 2 minutes per side. Place on a cutting board and cut into 1-inch cubes.
In a very large bowl, combine cherries, bananas, coconut and orange juice and toss to coat. Add cake cubes and toss just until coated. Add a few more tablespoons orange juice to further moisten the cake if desired.
Per serving (will depend on cake used): 300 calories (70 from fat), 8g total fat, 7g saturated fat, 0mg cholesterol, 190mg sodium, 55g total carbohydrate (4g dietary fiber, 15g sugar), 5g protein