Hi Deli Dave
When in France during the last few years I have used a variety of sources for free wi-fi internet use.
Some Campsites, eg, Chalon de Champangne, Salbris. Some it is necessary to get close to the main buildings - others have coverage over the whole site, the latter means that the laptop can be used for longer plugged into the caravan electrical supply.
Tourist Information Offices, eg, Portes en Re, Sallanches
MacDonalds, in Sallanches I sat in the adjacent public car park, that meant I could run the laptop longer via an inverter.
Various other locations, eg, the computer shop in the market place in Argeles Gazost offered free, 24 hour wi-fi. They announced this on an notice on the shop door and even provided a table and chairs for clients!!!
Some of these free wi-fi "hotspots" need a password others don't.
It is important to remember that these wi-fi sites, particularly the ones without passwords, are VERY insecure and should preferably not used for confidential information like internet banking.
Beware too those campsites that do charge for wi-fi connections it is often very expensive and time-limited, eg, so many hours in 24.
Wi-f is very useful we use it emails home, checking out campsites and places to visit, travel routes even go on caravan forums!!
Have a good holiday but don't spent it all on the computer!!! I was reprimanded and reminded I was on holiday by a passerby on the site at Salbris!!!
Tim