If you don't want anything to happen to your laptop then don't let it associate with the unknown Access Point. Maybe that is why they have it unsecured so you will get on their network and they will get into your computer and put a virus on it or zombie program. Don't play with something you don't know about! Especially if your frightened of it in the first place.
Tammy F> I got a (very) nice laptop computer for Christmas/my birthday, it has wi fi.