Hi Robin:
Well, I'm all for relaxation, whenever and however it's available!
What I think is cool is when students who may have only a vague idea about what they will be doing in the work setting, get to picture themselves as employed. It may be a vision they've not yet (or ever) imagined. Many get very jazzed and inspired about their chosen field, and then are better motivated which leads to better performance in the classroom, and ultimately, better workers.
Fileld trips are sorely underused by many teachers, and it's a shame because this activity benefits the students in many ways. Same for the guest speaker. To hear success stories from recent grads or long time workers can really be dramatic and have lasting effects. More!
Regards, Barry