There's nothing more peaceful than sitting by a river and watching the water as it makes its way downstream. Why not pack a picnic basket and spend a quiet afternoon at Source of the Danube?
This flowing body of water in Donaueschingen is one place that's well worth checking out — and the best bit is, it won't cost you a cent to enter! Other sights close to Source of the Danube include Huefingen Roman Bath Ruins, so keep some time up your sleeve to swing by there as well.