hah, I made those for Rogue_Alphonse and his girlfriend the other day. You can have no idea how hard it was to find creme of coconut in rural road island. Went to three different stores and spent about half an hour looking for the damn thing. Good stuff though, I left them enough to make more.
Some people use mixes but I have no clue why, its one of the easiest drinks to make, 2 part's pineapple juice, 2 parts creme of coconut, to 1 part white Puerto Rican rum, I use Don Q. Fill the blender with ice and mix until frothy.
Mixes make it taste like cough syrup, they use too many artificial flavors. Also you can use more or less rum, me I like enough so that I can taste it.