Use it - then send'em a bill for "beta-testing" their unsecured network for them.
My neighbour's wifi is unsecured, but he's a buddy of mine...so I don't take advantage of it. No use for it since we have two separate IPs here anyways.
Our Niagara region is ripe with hotspots everywhere, though. All the major hotels run wifi and its easy to gain access to many of 'em down by the Falls.