Here's a NASTY CHEAT for RCT 1 & 2! If you are strapped for cash do the following:
1. Place a "No Entry" sign at your Park's Exit so the Peeps cannot leave.
2. Find a Bridge over Water (Or build on if you have none.) Place "No Entry" Signs at both ends of the Bridge.
3. Place "No Entry" Signs at Strategic Locations throughout the Park. (You want to make ALL of your Peeps go onto your Bridge) Close your Park and all Rides and Attractions
4. Wait until all the Peeps are on the Bridge, then DELETE THE BRIDGE and watch all your Peeps drop into the water! (And Drown!)
5. After your Peeps have drowned, get rid of all the "No Entry" signs and re-open your Park and all Rides and Attractions
If you do this, within 30 minutes you should amass almost $500,000.00 because of all the Peeps who will enter your Park to replace all those who drowned!
DISCLAIMER! Do Not Do this in Real Life (Unless you want to be Featured on America's Most Wanted! 
)
Answer my Prayers, Overbook my next Flight!