One would also need to remember that even though you have permission on one network does not mean you have that same permission on another network. Each node between you and your target may have different TOS/AUP in place. Take a look at the link I gave you it does contain a lot of good info, first and foremost the advice of a lawyer is going to be one of your best bets.
Well, in short, I am own the target network, so i'm good on that, I could try to contact the ISP of the wifi hot spot, which would probuly be worthless, as I am using the spot for a short period of time, and obtaining written permission within an hour is unlikely. The best solution would be to speak with the individuals in charge of the hot spot. That would not be difficult in this case, being that I work here, and the boss is okay, but this information was also for future reference.