Staying in Valvigneres puts you in an ideal place to experience the most wonderful sights by taking a few short drives. The most spectacular, maybe, is the Gorges de l'Ardeche, a series of canyons and natural rock formations along the river ardeche. There's a nice scenic drive to be had here by following the river along this stretch for 10km or so starting at Valon Pont D'Arc.
The natural arch on this stretch, the Pont d'Arc (see photos), is a great place to picnic, sunbathe, splash about in the water or even canoe, and the "villages tres jolies" that surround the gorges mean that you won't need to worry about whether or not you can make the visit stretch to a day.
In addition to Valvigneres (which I think I've probably gushed about quite enough in the Tour Casse journals), you've also got wonderful little hill-top villages like St Thome - just a mile or 2 from Valvigneres. Any fans of Jean de Florette will find this place a real joy. Also you have the most beautifully rugged and fragrant herb covered hills and bubbling little streams in between.
This is not the type of journal where I can say the Eiffel Tower is here, the Louvre is there. With the exception of the Gorges formations themselves, the attraction of the area is the area itself. Everyone will find their own, personal, favourite spot. The only thing I can say is that by roaming around this relatively small area, especially outside of the busier July/August periods, weather permitting, you can not fail to fall in love with it.