Anything about hotels. Interior, exterior. Mainly architecture, but typical hotel scenes (reception etc.) should fit as well. The photos should clearly convey something about the hotel, not just be incidental snapshots.
Please use a country name in your tags, and now that Flickr's Organizer lets you place images on a map, it would be helpful to take the extra couple minutes to place your photos as precisely as you can on the map. This will let us all browse by street and neighborhood much more easily.
In case one has a different opinion, please discuss.
