"Why did they do this in the wee hours of the morning? Is the park too busy during the day?"
Well... here's a bit of a what if for ya...
What if for some odd reason, the crain broke and smashed into Magnum while it was running?? That could have the possibility of sucking... that would be my personal guess as to why they did it at night. Same as SFMM... they'd done all their work at night to my knowledge. Areas that are that close to public areas are usually done when there aren't any people around. At least that's been my own experience...
JD
http://www.westcoaster.net