You are new in a job, actually your first job you hold.
You have not really started, just been visiting and getting to know the people working there.

Then you boss calls and tell that there is a change of plans. You are to work in another department with cooler tools and more resources. He just want you to test it out, learn, and have som fun.

What do you answer: No thanks boss. I would not like to do that, I will do as we first planned.
That sounds like the wrong answer.

You take the chances/gifts you get in your career. They might not come back.