You like the Free WiFi access points? Then you should use a VPN...

All the details you'll find here:

http://www.sans.org/reading-room/whitepapers/hsoffice/soho-remote-access-vpn-easy-pie-raspberry-pi-34427

or

http://readwrite.com/2014/04/10/raspberry-pi-vpn-tutorial-server-secure-web-browsing

When Iam done I'll post my notes ;-)