Couple tips:
-Take at least an 18 pack with you. Drink one beer per hole.
-Take a bottle of tequila/bourbon/rum and a shot glass with you. Whomever gets the best score on a hole has to do a shot before they tee off for the next hole. If only playing 9 holes, use a bottle of Wild Turkey 101 or Bacardi 151.
-If you have to swing at it more than three times, pick it up and throw it. This becomes very important the longer the game goes on for. An old racquetball racquet will work wonders here for distance. A potato cannon also works well.
-Bring a swiss army knife. Not just to open the beers and slice limes for the tequila shots, but to remodel the course and move the holes if necessary.
-Keep the number for Dominoes pizza handy. About the 8th hole, you'll be needing it. Ask them to deliver to the 12th hole, tell them you'll meet them there.