Tips
Old rides have a low reliability rate, which means the rides will break down more frequently.

Having handymen mow is a waste of time, and I always turn it off

When a guest is about to walk into your park, pause the game. Make the price of the park exactly one dollar less than what the guest is carrying. They'll always come in, no matter what. If it's the exact amount they have, sometimes they don't come in.

1 day= 10 sec.
1 month= 5 min (a 30-day month)
1 year= 1 hr.

you don’t need a waiting line. best for small rides, when you don’t have the space

don’t build food/drink shops next to eachother, split them up around the park. Building a food court is a bad idea. Best way to go is one drink, food, and a bathroom. Snacks don’t sell that well next to food.

Adding scenery and water near rides increase their excitement rating.

Having rides with tracks going near other rides dramatically increases the excitement rating, this means you can charge more.

Scenery reduces the likelihood of vandalized.

Make sure guests never have to wait more than 10 minutes for a ride.

Raise the price of umbrellas to $20.00. Guests will buy them if it's raining regardless of the price.

Information desk's should be immediately put at the entrance of your park.

People like to sit down well they eat

you can make no entry sign's that stop guests from passing under, this just stops guests.

If a ride crashes and people die, nobody will want to ride it. Renaming it can help

people will happily pay for the restroom. I just stick it to $0.10

If you place a ride exit right into the park fence, guests will exit and wander around the single tile outside the fence. You can pick them up and place them back into the park whenever you choose.

Special Guests
Give one of your guests one of the following names for the desired effect.
Password Effect
Michael Schumacher A fast go-kart racer
Melanie Warn Automatically Happy Guest
Damon Hill Fast Go-Kart Driver
Simon Foster Guest Paints Pictures
Chris Sawyer Guest Takes Numerous Photographs
Richard Branson Guest will make other guests rich
John Wardley Positive Thinking Guest
Mr.Bean Slow Go-Kart driving
Katie Brayshaw Waving Guest

You can have more than one person with the same name by changing the capitalization of the name's letters.
Example: There can be four or more Chris Sawyers in your park if one is named Chris Sawyer and the others chris sawyer, CHRIS SAWYER, and cHrIs SaWyEr.

Glitches

Free paths.

Guests can actually walk across non-built paths. Just keep the path to be built flashing in the position you want it at, and guests will be able to walk across it like a normal path. Be warned, that if you move the path while a guest is on it they will fall to the ground.

Hovering Guest

Pick a random guest up with the pincer tool and hit backspace. The guest should remain in the position that he was in when you picked him up with the pincers.

Mysterious Disappearing guests

You raise a piece of land as high as it can go. Put a guest on top of the land,and quickly lower it. The guest should fall down slowly. If not, try again until the guest falls slowly. When the guest is about to hit the ground, then quickly raise the land. If the guest already hit the ground, then the glitch won't work. If done correctly, then the guest should fall through the ground. Make sure that you have memorized the guest's name, and keep his window up. Eventually, the window will disappear, and his name won't appear in the guest's list. So, the guest mysteriously dies. You can also do this by deleting underground path with people on it.

Remove tall grass

If your grass is really getting out of hand, just choose the land leveler. Click once on the plot of grass and the tall weed will disappear. It still won't be freshly cut, but guests won't complain about uncut grass. Plus, it's totally free compared to the handymen.

Easter Eggs

Pop the balloons!

When someone lets go of their balloon and see it rising higher and higher into the sky click on it and it'll pop!

Quacking ducks

If you click on a duck when it is flying or swimming, you will hear a brief quacking noise. It is said they will give you good luck

Secrets

Close a Ride and Keep the Line

If there is a long line for a ride and you want people to get into it quickly, pause your game. Open up the ride window, double click the red light to close it and then double click the green light to open it. The ride should have reset itself, and all guests that had been on it are now at the exit. You should still have a line waiting to ride the ride. Unpause the game, and repeat as needed. *note: this will not work if a ride has broken down!*

Guests Can't Leave

Place a sign facing away from the entrance right in front of it.
then right click it and click the no entry sign on it and none of your guests can leave.