Hackers often give their rogue hotspots generic names such as Coffee Shop, Linksys or AT&T Wireless. You want to be certain you are connecting to the router of the business.
Tweak your gadgets' settings so you have to manually join networks in public. Then verify with a store employee that you are connecting to the correct network.
You might think that an establishment with password-protected Wi-Fi is safer, but that's not the case. Passwords are good for keeping people out of your home network, but for public networks, anyone can join. Once a hacker is on, your gadgets are accessible.
By the way, your home Wi-Fi is encrypted, right? If not, you're grounded from going out in public until you lock it down! I have detailed instructions here.