They're nocturnal so if you're going to see activity it's going to be pretty much at night.

It's kind of hard to put into words but normal activity is more just exploratory, checking stuff out and so forth. It wouldn't be normal if the snake is really antsy, nose rubbing on it's enclosure like mad, acting very tense, striking at the sides of it's enclosure, trying to cram itself into odd places or postures.