Re: GCT name tags
The guides like it if you wear a name tag, I usually don't wear one: however, I may have it in my pocket if they ask about it. The only time that I ever remember needing it was for at one hotel for breakfast, the waitress wanted to see it for verification that you were with GCT (i.e. got the included breakfast).
Here's my tip: After the trip I make a luggage tag with it. I always have two luggage tags (different sides of suitcase) in case one gets ripped off (and they frequently do). I like plastic luggage tags in lieu of paper ones, the plastic holds up a little better, etc. I put an address label on the back side of the name tag and fasten it to the suitcase with a small cable tie:
Works great, and when it gets ripped off you aren't really out anything.