Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Use a text editor to edit the "standard.sam" file in the "levels" sub-directory inside the game directory. Scroll down until the "Bank balance stuff" heading appears. Go down a few lines and change the starting balance from "$50000" to any amount.
All worlds
Note: This procedure involves editing a game file; create a backup copy of the file before proceeding. Use a text editor to edit the "global" file in the "data/levels/space" or "data/levels/fantasy" folders. Change "keys.to enter" to a desired number.
World of Wonders park
Collect three Golden Keys to unlock the World of Wonders park.
Space Zone park
Collect five Golden Keys to unlock the Space Zone park.
Hints
Easy money
The best way to use this trick is on a puzzle sideshow that has a low play cost. While somebody is playing, up the play cost to $10,000. Make sure that you hit the confirm check to get that price activated. When they finish the puzzle you will get the $10,000 instead of the lower play cost they started playing at. Nobody will play at $10,000, so lower the price back down to a fair price afterwards. You can do this as often as desired. Puzzle sideshow works best because it gives you time to raise the price while the customer is playing.
Power money
Start a small park with four puzzle games close together, two rides, one food, one bathroom and a gate price of $0. If you set it up so all four puzzle games are within view of each other, you can do the global price raise/lower for all puzzles while all four are active (making $40,000 at once). The $0 gate price will get the visitors in fast. Set the prizes value to $10 and a maximum win possibility. That makes the visitors happy, stay longer, and play more.
More visitors
When you are in Dinoland, just ignore or delete the message about the cheap gate price to get a lot of visitors.