Place bacon in a large, deep skillet. Cook over medium-high heat until evenly browned, about 10 minutes. Drain, crumble, and set aside.
Combine pineapple juice, red wine vinegar, oil, pepper and salt in a lidded jar or cruet. Cover and shake well.
Toss lettuce, pineapple, macadamia nuts, green onions and bacon together in a large bowl. Pour dressing over salad and toss to coat. Garnish with toasted coconut.
