Gently combine the melon, pineapple, chile and onion in a bowl.
Whisk the oil, garlic, vinegar, lemon juice and honey together in a separate bowl. Taste and correct the seasoning
Just before serving, drizzle the oil mixture over the fruit and gently toss to combine.
Cook Shrimp
Skewer the shrimp and grill or broil 1-2 minutes per side until they just begin to turn pink. Be careful not to overcook. Prawns should remain slightly transparent in the middle(?).
Divide the salsa between the plates and arrange shrimp on top of salsa.
Garnish with cilantro sprigs and avocado slices if desired.