Across the Rhône from Valence, the Ardèche bank rises fast. Guilherand-Granges and Saint-Péray sit at the foot of the slope, and above them the ruined castle of Crussol stands on its limestone crest like a broken tooth, visible from half the valley. This stop is on that western side, between Toulaud and Soyons, where the suburbs give way to scrub, vines and the first real hills of the Vivarais.
Do not be tempted by the Rhône itself. It looks broad and lazy, but between barrages, barge traffic and undertow it is no place to swim. The honest options are the pools in Valence, or the cooler side streams that drain the hills, where a paddle is more realistic than a swim. Think of the water here as a rinse for hot wrists after a long day rather than a plunge.
The land around is worth the detour. Soyons has caves and a prehistoric site in the cliffs above the village, and the slopes north of Saint-Péray grow the wines of Cornas, dark and serious syrah, and Saint-Péray's own whites, some of them sparkling. Crussol can be reached on foot from the village below for a view straight down the river towards the Alps on a clear evening.
For riders this side of the valley is a gift. The D533 climbs west from Saint-Péray towards Lamastre in a long series of bends, and smaller roads branch off into the chestnut country with tight, uneven corners and very little traffic. The surface on the minor lanes can be broken, and summer storms leave grit in the hairpins. The east-facing slopes cool off early in the evening, which makes the return leg pleasant even in July.
Guilherand-Granges has everything a town of eleven thousand offers: fuel, supermarkets, bakeries. Valence over the bridge adds more of everything, including traffic. If you want a quieter coffee, stay on the Ardèche side and let the city glow across the water.