If a BP is super stressed he's going to curl up into a ball and hide his head, not crawl around looking at stuff.. if he looks curious, he probably is.

As long as you keep a close watch on them and make sure there aren't any dogs/cats/etc around that could harm him, there's nothing wrong with letting him roam around a bit.. just be careful that he doesn't get into some tight place that's hard to get out of.

I've heard of the snake walker before... looks pretty silly to me, I don't see a point to it.