Drain pineapple, reserving juice.
Stir together pineapple, mango, peanuts, and coconut.
Stir together reserved pineapple juice, coconut milk, and next 6 ingredients; add to pineapple mixture, tossing to coat. Chill 30 minutes.
Note: For testing purposes only, we used drained mango slices in a jar, found in the produce section of supermarkets.