There really isn't much history available on the Aku Aku Lapu other than it's origin: The Aku Aku restaurant in Las Vegas circa 1960.
What really attracted me to the Aku Aku Lapu is the potent rum list. Dark Jamaican, Lemon Hart 151 and Gold Puerto Rican. What's not to like! The recipe is a double, but eyeballing the ingredients and it looks like it could just as easily be a single.
1 oz gold Puerto Rican Rum
1 oz Lemon Hart 151 Demerara rum
Combine all ingredients in blender and give it a spin for 5 seconds. Pour into Tiki Barrel mug or share with two. Garnish with parasol.
Aku Aku Restaurant (Las Vegas) via Beachbum Berry's Remixed
Putting the drink together, I knew it was going to give me a blast of citrus right from the get go. A combined four ounces of pineapple, grapefruit, orange and lemon juice starts the Aku Aku Lapu off with a bright floral note (coming mostly from the grapefruit and orange).
Next up, you'll get some sweetness from the orange, pineapple and falernum, followed up by the rich smokiness from the rum. The LH151 really does a number here. The drink finishes up with the tartness from the lemon, which is actually refreshing and really nice.
For me, the weakest part of the drink is the sweet notes. The falernum is omnipresent, but the pineapple and orange juice aren't quite enough to stand up straight against the rum and tartness of the lemon at the end. I would recommend adding some simple syrup (no more than 1/2 oz) or overpour your homemade falernum slightly.