Rename a guest to one of the following: 

• Want a million dollars?  Shut-down your entire park (everything, every stand, every ride, etc.) for a year before you reach March of Year 2.  After a year passes a man in a blue suit will arrive and give you a million dollars.

 
• Want Einstein himself to help you on your research?  Find Guest #1 and rename him "E=MC2".  Next find Guest #2 and rename him "E=MC3".  The two will meet and begin to talk.  Soon after that they will ask you to hire them as park researchers.  Tell them yes and devote your resources to research.  The next year you will have many new rides available and almost one billion dollars.

 
• Maintain a high park rating the mafia way!  Pick up all unhappy and drop then in water.  The guest will drown and your problems will 'disappear'.