Reminds me of the bar i go to all the time. They have wireless, but i've noticed it hasn't worked for like 3 months. Anything wired goes great though. I should see if they want me to fix it. I'll probably get several free drinks, or other cool things, like a computer (what happened last time when i backed up music for them from a hard drive that wouldn't boot for them). I also got free drinks a long with that.
Make sure it's cool bar. Of course tell them not to touch the equipment. I wouldn't be surprised if a bar tending yahoo who knew about the reset button on these things pushes it without thinking what it's actually going to do. This bar you're making this simple setup sounds like it doesn't need any documentation at all really. Wifi access point, router, bla bla bla, probably easily found too.