I tell you what, a day tour going down the Tarn gorge, across the Millau viaduc, then off to Navacelles would be pretty much unbeatable in the right weather.
The small road from the autoroute up to Navacelles has just been resurfaced for quite a bit and is a gem, and absolutely no traffic whatsoever, none, when we were there a couple of weeks ago. Bliss.
You know you want to