The only listing for a waikiki Sour is at the Mango Cafe, Stoupa Messinias,
Greece. It does not list the ingredients.
http://kythira.softlab.tuc.gr/~konkla/Menu.html
It's probably a whiskey sour mixed with some fruit juices.
Whiskey Sour
1 shot whiskey
Sour mix
Garnish: Cherry and lemon slice
Stir and garnish.
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Waikiki Tease
1 oz. dark rum
3 oz. orange juice
2 oz. pineapple juice
Instructions:
Pour all ingredients over ice in a glass. Stir.
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Waikiki Beachcomber
3/4 oz Gin
3/4 oz Triple Sec
3/4 oz Pineapple Juice; Shake
Rocks Glass
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WAIKIKI BEACHCOMBER
3/4 oz. gin
3/4 oz. triple sec
1 t. fresh pineapple juice
Shake with ice and strain into cocktail glass.