Keep in mind, if they're saying your internet is "wifi", than they run the infrastructure in-house, and might not allow you to bridge behind their service. Most wifi setups limit you to a single mac, so simply bridging through isn't good enough, you'll need to NAT out the wifi. This is a bit backward from how ddwrt does it, and will require some special/custom config.
Sort of crappy they "only" provide you a wifi-only option - is this some sort of apartment, dorms, or...? Considering most hotels I've been in run the worst wifi experiences I can find, I can't imagine any MDU operations properly manage wireless oversubscription and overuse properly to keep the entire experience anything less than crap as a primary means of connectivity.
You can always get one of these to deal with those pesky wifi hog neighbors...
Just kidding, well, sorta...
-mb