Intellectual Property Law
Intellectual Property Law Questions? Ask a Lawyer
This invokes copyright and TM issues. On the TM side, you can use the hotel's images/text etc. but only to the extent necessary to describe your sweepstakes. On the copyright side, you really should not use any images or text without permission, unless you are showing the gift card itself. Also, you should not present this is a way that gives the false impression that you are affiliated with or sponsored by the hotel.
correction...for the TM section, I meant to say you can use their name/logo as is necessary
let me know if I can clarify anything