To dream of an amusement park represents a chaotic situation in your life. A lot of ups and downs or unpredictability wherever you turn. Anxiety about unpredictable situations you feel compelled to go along with.
Consider the specific rides for additional symbolism.
Example: A man dreamed of being in an amusement park. In waking life he had a very busy day at work the previous day with all kinds of chaotic moments and stressful changes.