France, south of Lyon - suggestions please

Next month I'll have to go to Valence (between Lyon and Marseille) for work. I'll be finished on a Friday and thought about bringing my bike to cycle around on the weekend. Never did France before and I understand it's hardly the most fascinating area, but does anyone have a suggestion of a little route I could take? Something like a leisurely 200km, fixed.

I could also get a train to a not-so-far-but-nicer region, if there's the chance.

Not tried it myself, but you can maybe try part of this route:
http://en.viarhona.com/

I was going to say you're quite close to the alps, but fixed...

Not tried it myself, but you can maybe try part of this route:
http://en.viarhona.com/

Just done it in a hurry,
no map ,
just trying to find sometimes elusive signs,
it's far from finished yet.
Some bits are done but according to the dedicated map,
they are still under completion,
other bits are there,
but poor directions led me to use the roads 1/4th of the way.
Wonderful for the existing bits,
especially going south enjoying prevalent winds.
Wildcamped, pack flipflops to step into the bath/washing machine.

From Valence,
I did the north bit, no trouble, lovely up to Vienne.
South was veering away from the Rhone,
I knew from reading beforehand that directions were hard to find on that strech.
Short of time,
I opted for some fast riding on a busy road,
close to the Rhone on its right bank.
When I got back on the viarhona at La Voulte,
I was back in cycling heaven.
Very few cyclists during the week at this time of the year.
No idea why you think it's hardly fascinating,
following one of the largest river in Europe in a rather narrow valley,
makes for some effortless and spectacular riding.