Roller Coaster Tycoon 2

Hint: Transparent Trees
To make trees see-through, press 4.

Hint: Get more money than you started with
First build a 5x5 block with the base blocks, then make it 10 blocks high, then build a ride on it. (e.g. bumper cars)

Build the entrance and exit then remove the ride and all the blocks and you will see that you have more money than you started with.

Unlock weird comments
Submit the guest name Andy Hine, then watch him after he leaves a ride.

Also try submitting the guest name David Ellis, then watch him when he enters a ride.

Free Money
Go to the Finances by pressing "f", then press ENTER + "M" for $5,000. This can only be done once a month for unlimited amount of cash.

Photographer Guest
When prompted for a guest name, use Chris Sawyer.

Artist Guest
When prompted for a guest name, use Simon Foster.

Increase Guest Happiness
When prompted to enter a guest name, use Melanie Warn.

Waving Guests
When prompted to enter a guest name, use Katie Brayshaw.

Get A Hungry Guest
When prompted to enter a guest name, use Tony Day.

Double Entrance Fee
When prompted to enter a guest name, use John Mace.

Intamin Fan
When prompted to enter a guest name, use Elissa White.

Slower Karts
When prompted to enter a guest name, use Mr Bean.

Fast Go-Karts
When prompted to enter a guest name, use Damon Hill. Use Michael Schumacher if you want to race faster again.