For my job i require multiple night hotel stays on occasion. This idea has stemmed from that and thinking about how much of a waste it is to have my room serviced for every night that i am in a certain location. I don't need an immaculate room to stay in nor do i need clean towels and sheets everyday. Not to mention the daily waste of chemicals that is unessacarily used in cleaning all surfaces every day.
So I just keep the "Do Not Disturb" sighn on my door for the whole duration of my stay at any hotel. If 50% of people did this this at every hotel/condo they stayed at, the environmental impact of such establishments would be greatly reduced. As an added bonus, if no one is in your room less chance of anything being stolen!
If you run out of anything either;
A. take it off a random houskeeping cart
B. Call and they will deliver it
my $0.002