Head to Green Beach and spend a quiet afternoon strolling along the water's edge. There's something about being by a river that makes you feel calm and peaceful.
When you've spent a bit of time at this Saint-Lo flowing body of water, why not make your way to Notre Dame Church, Velorail of the Vallee de la Vire, and Museum of Fine Arts? They're not far from Green Beach and also a hit with many tourists.