I'm going to force my mother to cancel her own plans for my surprise day out
Why? Are you doing something else instead?
I really wanted to go to the "Magical Land" amusement center.
It is normal to want to do things that you want to do but you cannot force others to do what you want. That's not how life works.
There's nothing wrong with that at all.
It's inconsiderate to assume others should bend to your wishes and yours alone.