Combine first 7 ingredients in a small bowl; stir well with a whisk.
Peel shrimp, leaving tails intact. Devein shrimp, if desired. Combine shrimp and 1/4 cup vinaigrette in an 11 x 7-inch baking dish, stirring to coat. Cover and chill 1 hour.
While shrimp chill, combine remaining 1/4 cup vinaigrette, tomato, and next 3 ingredients in a bowl, tossing gently to coat.
Remove shrimp from dish; discard marinade. Thread 4 shrimp onto each of 4 (10-inch) skewers. Place skewers on grill rack coated with cooking spray; grill 2 to 3 minutes on each side or until shrimp are done.
Place 1 cup salad greens on each of 4 plates; top each salad with about 1 cup tomato mixture and 1 shrimp skewer. Sprinkle each salad with 2 tablespoons toasted coconut.
Note: If using wooden skewers, soak in water 30 minutes before grilling.