Hotel wi-fi rant......

[markem]

while not exhaustive, the free wifi locator website may have some useful information for you.

http://www.wififreespot.com/

The list of hotels can be used to leverage the one you are staying at ... possibly

http://www.wififreespot.com/hotels.html

I've never used openwifi, but they may have something useful as well.

http://www.openwifispots.com/

found a google map app as well: http://www.gwifi.net/