We'd all donate more to charity if we had the time, right? Now you can do it in your sleep. Book a room at charityhotels.com, and the hotel will donate five percent of your room rate to the participating charity of your choice, including UNICEF, Amnesty International and the Red Cross. Hundreds of mountain-town properties are listed—from Stowe's Stoweflake Resort to Harrah's Lake Tahoe—and the website's room rates are comparable to other discount travel sites. For example, a one-bedroom condo at Vail's Lion Square Lodge in February comes to an identical $546per night at charityhotels.com and travelocity.com. Now what's your excuse?