I typed in: I work in a amusement park. For some reason, I got this wrong. Please advise.
An amusement park is a kind of permanent carnival: for example, it would have rides such as a roller coaster, a ferris wheel, a merryground; booths that allow you to throw or shoot something at a target in order to win a prize.
A theme park usually has a particular, um, theme, or motif, that characterizes the entertainment and rides offered: Sea World, Disneyworld, and so on. In such a park, each form of entertainment would somehow incorporate that theme.