Three letters: VPN

Find out what it is... If you are a business traveler demand that your company provide it for you.

Wi-Fi security just isn't on par with a good solid VPN solution. Also, even if you aren't worried about others seeing your online data, consider that they may be hacking your computer and looking at your data or maliciously using your system in other ways. While not the best solution, a simple personal firewall is a good first step.