I had a similar, though not identical problem. I also took an apple tv to a hotel and forgot the remote. However, in this case, I was using my express modem to wirelessly distribute the hotel's LAN into my room. Although I had used the ATV on my home wireless network, I had never used it with the apple express modem that I brought. This was easily solved by changing the name and password of the apple express modem using airport setup utility on my macbook air (I guess that the airport setup app available for iOS would have also worked) The ATV connected to the wifi just fine and there was no need to set up a third party tv remote. After that I could control the ATV using the iOS remote app.