Theme Park is a text adventure - so no graphics, and no sound effects!
But if you want to set the right mood, put in your favorite horror
soundtrack, or check out the Fat Man's soundtrack to the 7th Guest and the 11th Hour, classic horror adventure games from the early 90's. (You can also find game midi's here, although the quality is lower.)
If you're desperately lost or unable to solve any of the puzzles, I've provided a complete walkthrough. Don't read unless you really want to spoil the fun, though.