San Gil is a small Andean city in northern Colombia, straddling the River Fonce. It’s known as a center for adventure sports. Facing the main square, Parque Principal, is the 18th-century Cathedral of Santa Cruz. Riverside Gallineral Park has huge trees hung with curtains of silvery moss, and offers access to white-water rapids. East of town is Balneario Pozo Azul, a natural pool with big stone slabs and waterfalls.