Otay Lake

A cat can easily fish here if they have any idea how, as the Humans keep it regularly stocked with fish year-round. Perhaps if the Humans aren't paying attention, you can swipe some food from their picnic baskets.
There are also many different trails, so it is possible to make a part of it your temporary home with a decent way of finding your way around (the water creates moisture in the air, thus washing away scents fairly quickly, even in the California heat, so no permanent territory markers can be made), but this is discouraged by many local felines because of the amount of Human hikers.