Tucked along the edge of the Sacramento-San Joaquin Delta, Big Break Regional Shoreline offers visitors a rare glimpse into one of California’s most endangered ecosystems at no cost. The 1,600-acre park, which opened in 2012, sits at the confluence of two major rivers where saltwater and freshwater meet. Most of the park consists of submerged former farmland. … [T]he park’s wetland habitat is its most significant feature, as roughly 90 percent of similar ecosystems in California have been lost to agricultural development. The remaining landscape at Big Break supports a variety of aquatic mammals, including river otters, beavers, muskrat, and American mink, along with dozens of bird species.