RollerCoaster Tycoon

Use the finance command by pressing F. Then press M + Enter to gain $5,000. Note: This can only be performed once per month.

Picture guest 
Enter "Chris Sawyer" as a guest name to have him walk around and take pictures of your park. -From: Fmodena1@aol.com
Painting guest 
Enter "Simon Foster" as a guest name to have him walk around and paint pictures in your park. -From: Fmodena1@aol.com

Tip: For quick cash, make rides free and charge Disneyland prices at the front gate (about $50). But be sure to have other options (such as food and ride photo ops) to get customers to spend more money once they're inside the park. 
Tip: When people get bored with a ride, repaint it or go to the marketing screen and offer free vouchers to rekindle interest. 
Tip: Keep adding new attractions to your park to keep its rating high. Ratings decline slowly over time unless you keep your park growing and changing.