From my experience it never hurts to be honest with the hotel people. If they find out there is a film shoot in one of their rooms they are likely to bemore helpful and accomodating than perhaps they would otherwise. SO talk to them, get them to sign a release if you want, but just tell them Rwhat's going on, and as long as you get persmission it should be fine. Release forms are best used when you are not sure about the subject, ie if they are being tempramental or you may think they'll pull out after filming etc.