Well a warm welcome to you Photoman
I have been on many USA tours with JY but not the one your going on. The ones I have been on are full on can be early starts and out for most of the day, to come back to hotel quick wash and brush up have a meal out and then relax for an hour or two. You do see and do so much along the way that's why I like them, great opportunity for taking pictures as well. If there are any extra excursions if your bank balance allows try and do them, also the tour manager sometimes has other things planned so there could be more on offer than in the brochure. Put your JY labels kn your hand luggage as that quite often is the ice breaker people seeing the labels, if you have the use of a lounge from JY in the terminal most people meet in there, if not don't worry you will meet up with people along the way.
if you have any other questions just ask.
Cindy