Build side shows such as Arcade, Gopher Bash, etc. Then, press Circle when the building is highlighted to enter the information screen. Set the chance of winning all the way up, so that the visitors always will win. Next, set the cost of the prize to about $20. Then, set the cost to play to about $40 to $45. Your guests will always win and stay happy, and you will never lose any money. If enough people play you can easily make a nice sum of cash.