Sorry for being dense, but which departure date have they changed? To Denver or from LV to home?
I would probably opt for no flight changes, cancel your pre-tour extra night and book an extra night in LV which will likely be less expensive than a flight change. I bet you will be able to extend your same room and not have to switch rooms or hotel.
I would probably opt for no flight changes, cancel your pre-tour extra night and book an extra night in LV which will likely be less expensive than a flight change. I bet you will be able to extend your same room and not have to switch rooms or hotel.