Dissolve sugar in hot water. Mix the pineapple juice, vodka, gin, rum, water, and lime-ade with the sugar water. Freeze in a large container. My sister's recipe says to add the 7-up to this before freezing, but it just turns out to be pretty much a big chunk of ice on top and all the other stuff on the bottom. What we do is fill each glass 3/4 full with slush and then add cold 7-up and mix a little.