This is as close as you can get to Bob Chins, key is to let airate constantly...
2 C. pineapple juice
2 C. orange juice
3 C. Mai Tai base (trader Vic or Mrs. toms)
2 Tbs. Orgeat (almond flavored syrup)
few dashes grenadine
1 1/2 cups Meyers dark rum
1/4 cup white rum