UPDATE 6/16/11: Should've said this is a Starwood Hotels program, so you may find it at a Westin, a W Hotels, etc.
Forget 5 cent fees and rewards - Sheraton Hotels are putting some real weight behind their effort to get customers to buy in to conservation efforts. And since hotels can save big bucks on staff time and water costs if they don't have to strip and wash your still-clean sheets every night, why shouldn't conservation-conscious customers share in the savings?
With the Sheraton's Green Choice program, guests who decline housekeeping service get a $5 voucher per night towards food and non-alcoholic drinks:
Worth noting that Sheraton has also been a leader in going smoke-free.
I would show you a picture of the food I purchased with the vouchers, but it's long gone. After a long couple of days on Louisiana's Bay Jimmy, I was in no mood to conserve the freshly-fried fish in front of me.