I’m happy to help!
Based on the context, it seems that “开园” (kāi yuán) means to open a park or an amusement park. Therefore, I would answer:
“When is the park opening?”
Or, since there are several exclamation marks (!!!), you might be emphasizing your enthusiasm and eagerness to know when the park will open.
Let me know if that’s correct or if I need further clarification!