Rum's an odd mistress. I always linger with Bacardi, which has to be with coke. But Captain Morgans...mmm... And, for some reason, I can only mix the Captain with Dr. Pepper. Those two are a magic combination.
Shit. Now I have The Calling.
Rum and OJ works, as well. The "rum screwdriver," but you can add various things and create any number of "sunrise" variations. I find that the soda gets a bit cloying after awhile. (Say, five rum and cokes in.)
Now, let's talk Feuerzangenbowle (literally: flaming fire punch). My German teacher in college turned me onto that shit. Get yourself some heated, mulled wine in a big bowl. Put a cone of sugar across the top on a stake. Pour 151 rum over the cone and torch it. Tell stories by the light of flaming sugar while you empty the 151 into the punch. About a finger of that shit takes you to the mushroom planet.
Rum has long been my friend.