Occupying San Clemente Canyon alongside Highway 52 between I-5 and 805, Marian Bear Memorial Park is a small slice of riparian oasis in an urban landscape. Except for freeway noise, it’s easy to forget we’re in the city. A canopy of large old sycamores provides shade. San Clemente Creek trickles quietly. Then a truck rumbles by to remind us we’re close to the road, on a relatively narrow strip of green space, wedged between University City and Clairemont Mesa.