This recipe makes ~1.5 gallons of medium-strength rum punch. This is enough for 6-10 people, depending on how heavy they drink on average.
600mL Rum (probably sold in a 750mL bottle)
1/2 cup Cointreau (or Triple Sec if you want to go lower budget)
48 oz Mango Peach juice (or some other fruity concoction of your choice)
32 oz Orange juice
Directions: The hard part is getting the proper mix of ingredients. Mixing can be done in any order. You can also play with the relative portions of fruit juices and can always add more Sprite and rum if you start to run low during the party.