I worked for Imagineering for a bit and we would do all of our work in the parks at night. It is relatively quiet but there are plenty of white pick up trucks and workers around.

We did some stuff with the Indiana Jones ride and it was really cool to see it with all the work lights on. Many of the dark rides are fascinating when they power on all the lights. I bet that would be an awesome coffee table book.

(edit for typos)