If you can, get hold of a smoothy maker. A blender will do just fine. Chuck oranges, pineapples, a bit of banana, and some mango in and blend it all together. Drink.
Rehydration and Vitamin C galore = recovery from hangover!
Double whammy of multivitamins and iron and plenty of sparkling water - dare I say perrier with a hint of lemon. The water rehydrates, the fizzy cuts through the axminster on your tongue and the multivitamins help replace all that good stuff that you whazzed out the night before.
A combo of Resolve, sleep, serious amounts of calorific junk food, gallons of tea and as Prodigal rightly says, some down and dirty shagging. Sleep it all off and you're ready to do it all again in no time.