I hope this doesn't sound like a stupid answer but it's no use asking
in usenet how to plan a VFR route in some country.
One has to carry the charts anyway, so why not buy them. One can use
the 1:500k IGN charts (quite pretty and very clear but good only to
about 5000ft, which is very limiting for France where VFR flight can
be done freely up to FL105 and with reasonably easy clearance to FL195
or so) or the 1:1M official SIA charts.
It's indeed hard to plan VFR routes in France, due to the military
airspace, but most of that is at a low level and usually one can work
something out at 2000-3000ft. It can take an hour or two though...
especially with the SIA charts which have a separate booklet telling
you the vertical extents of the mil airspace.
However, there are easy routes in France which lie a bit higher up,
FL065+ is most cases, and I have described these at the end of here
http://www.peter2000.co.uk/aviation/leax2/index.html
They are the easiest way to get around France; the caveat is that if
you end up at the destination at FL065, above a solid overcast, you
have a slight problem with making a "VFR" arrival :) So you need to be
clever with the weather - whereas a pilot flying *below* the clouds
can just scud run and remain VFR (and they get killed from time to
time by flying into hills in poor vis, etc).
The SIA charts can be bought from UK pilot shops, or (cheaper) from
SIA direct and then you get the mid-yearly update too. The general URL
is
http://www.sia.aviation-civile.gouv.fr/default_uk.htm
and if you click on (Online Shop) Charts, it's at the top of the list
at 29 Euros. Afterwards (a year later) they mail you an invite to
update and you go to Subscription Renewal...