A dream that you are in an amusement park can be a signal that you need to reacquaint yourself with the playful childlike part of you.
You may have this dream when you feel burdened with many adult responsibilities.
The dream is a reminder that you need to be able to enjoy life and let loose once in a while in order to stay healthy, so you can do the things that you have to do.
On the other hand, a dream that you are in an amusement park can mean that you need to take important things more seriously and stop being distracted by trivial matters.
A dream that you find yourself in an abandoned amusement park can mean that you have forgotten how to enjoy yourself.