Wireless Internet access in NYC

Staying in the 36th floor of a hotel in midtown Manhattan has the advantage of receiving about 35 wireless networks, many of them unencrypted and with pre-configured IP address range ;)
So the hotel doesn't even have to bother offering Internet access to their customers, I guess.
The real problem is to stick with one AP, since everybody seems to use the pre-configured 'Linksys' ESSID, and the client thus thinks it can roam between them... which obviously doesn't work.