A quick and simple way to do this is boot up the Joint Venture scenario.
The mission requires you to make money with fast food joints so it is quickly obtainable with a few of those establishments. You will want so build some hotels to get tourists as they will help you rack up the profits.
While the mission has your focus on those you are also free to place taverns, restaurants and other entertainment buildings. Because of this the entertainment dollars will rack up pretty quick.