Back when I was traveling, I made a quest of finding places to stay that had a piano to practice on. Here is list of places that I have stayed that have let me practice on their piano. I have had good luck with places close in to Universities and Colleges.
The Carolina Inn
211 Pittsboro Street
Chapel Hill, NC 27514 www.carolinainn.com
Kawai Grand (Very Well-Maintained)
(My favorite! Last stayed/played there March 2008. Watch out! The hinges on the lid are not attached, so keep the lid closed.)
O'Casey's Bed and Breakfast
225 West Craig Place
San Antonio, TX 78212 http://www.ocaseybnb.com
Older Grand - Tuned, in use and playable.
Being a small B&B, you need to exercise some common send in picking the times you play, the sound carries to the bedrooms. Piano is available during the day and early evening.
Charlotte Douglas International Airport
Non-descript pracific rim grand.
Between flights, you can play a grand piano in the main lobby of the airport near the food court. Action is sluggish but you can make music with it. If no live band is using it. Great way to use the time waiting for a flight. I normally get a round of applause from the diners. Returning from a business trip, a few years back, I spent a memorable midnight to 1am improvising to a near deserted airport.