A bridge is a connection between 2 network segments. I've never tried to use an Asus AP as a bridge, so I don't know much about it.
But if all AP's are connected to the router by a LAN cable then you can configure all AP's as "AP only." (with different channels like I described earlier.) If they are not connected with a cable, then i just shut up and let people who know how to configure it do the talking.....
Then you are absolutely right to create a wireless LAN this way. Should also be fun and nice for visitors