Kind of a tangent, but most every hotel I've been at in the last at least ten years has the little sign in the bathroom about, "save the environment - reuse your towels!". I don't care for the nanny nagging, but am generally fine using a bath towel twice, and always follow the directions for where to put your towel if you don't want it changed out. I've never once actually had that happen. Every time I return to the room there are fresh towels everywhere.