Free Wi-Fi is a hacker's paradise
Free Wi-Fi? - beware of "Man in the Middle" attack!
FREE Wi-Fi zones are prime hunting ground for hackers
Using public FREE Wi-Fi is extremely unsafe because all the information to and from your device (iPad, phone, laptop) is transmitted in "clear text"; which means that it's totally readable by anyone with the correct equipment.
They will steal your ids and passwords, read your emails, watch you work, watch your bank transfers, watch your social network - they will HACK you.
Use a "paid for" VPN service and stay safe, encrypted and hidden
Buy a VPN program or app for your devices; they provide a secure and encrypted "tunnel" to protect all of your data - from everyone (including hackers, ISP recording what you watch, government snooping, etc)
The best value for money (ROI) cyber security product you can get - less than £6 a month.