All Items Researched:
While in park, enter this code. U, D, U, D, Left, U, D, U, D, Right…repeat
8 times.

Everything Free For You:
To be able to build, hire, etc. free of charge.. while in park enter this
code. U, D, Left, X, Circle (8 times).

Free Golden Tickets:
While in par enter:U,D,Left,Right,Circle,Right,Left,D,U,Circle (4 times).

Hints

Cleanliness Award:
Keep a set of highly-skilled Janitors to increase your chances of getting
the Cleanliness award.

Security Award:
Set security cameras all over your park to get the Security award.

Esthetics Award:
This award probably will not appear until your park is very well developed.
Research and build as many new shops and rides as possible. Place them logically
in a good looking arrangement without too much crowding to increase your
chances of getting the : Esthetics award.

Trash Bin Award:
All you need to do is place more trash bins around your park.

Upgrade Award:
Just continuously upgrade all of your rides and you’ll eventually receive
this award.

Path Award:
Make it so that people don’t have to walk far to get to their rides and
you’ll eventually receive the path award.

Build Everything For Free:
While in a park press Left, Down, X, O, Left, Down, X, O, Left, Down, X,
O, Left, Down, X, O, Left, Down, X, O, Left, Down, X, O, Left, Down, X,
O, Left, Down, X, O. You won’t have to pay to construct rides, shops, features
or even pay your staff!

All Golden Tickets:
While in a park press: Up, Down, Left, Right, O, Right, Left, Down, Up,
O, Up, Down, Left Right, O, Right, Left, Down, Up, O, Up, Down, Left, Right,
O, Right, Left, Down, Up, O, Up, Down, Left, Right, O, Right, Left, Down,
Up, O. You will recieve 255 golden tickets!

Thanks to Revolution readers Josh Rhodes, Jay V., m22intexas and Korsos!