This is a wonderful quote from Danny Hillis, computer game creator & innovator:

You go to a theme park with people you have a relationship with - friends, family - and you interact with each other in ways you wouldn't in normal life. You get into situations where you're frightened or excited together.

Parks take you out of the everyday and re-create that sense of wonder from childhood, the time when nothing made sense, when you didn't know what would happen next and didn't need to. They're wonderful, thrilling, and unpredictable - but safe.

Article in Wired Mag