Disney asks that you don't use tape or any other adhesive that can leave a permanent mark of any kind to keep them from having to do extra maintenance on the doors. If you use tape or mar a door with decorations you could have an extra charge added to your shipboard account for it. Magnets are ideal. I will warn ya, if your magnets aren't personalized and too nice they have been known to grow legs...if ya know what i mean...((wink-wink)). I can help you find some cool graphics and things to personalize & print up if you want. Just shoot me a PM. K?