Another great trick for getting your baby to sleep in a hotel room! From Megan:
During a recent hotel stay with my 14-month-old son (who tends to be a very light sleeper), whenever I put him down for a nap I would turn the television on to a "blank" station (one without a cable signal) and then turn the volume up until the static provided enough white noise for him to fall asleep and to help cover up the sounds of me moving around in the room.
Strategies for "darkening" the portacrib at bedtime in a hotel
Make your own white noise CD