Vikram Singh cites these Top 10 Hotel Web Design and Usability Mistakes:

1. Address and phone number not on home page
2. Fluffy taglines - "Blissful" etc.
3. Autoplaying music
4. Linking away to social media sites
5. Embedded YouTube videos with "show suggested videos" enabled
6. Stock photos
7. Media releases
8. Restaurant menus in PDF format
9. BOOK NOW! the only call to action
10. Clunky booking engine

Good stuff.