Open from 7 a.m.- sunset every day, the Upper Newport Bay Nature Preserve represents about 140 acres out of teh 1,000 acres that is the Ecological Reserve. It's located right out of Costa Mesa and is made up of the bluffs surrounding the Bay. This coastal wetland, one of the largest in southern California, is renowned as one of the finest bird watching sites in North America.
This preserve is also one of the best county facilities for recreation and wildlife viewing. There are plenty of trails that lead over the bluffs and allow you to view the rare wildlife that is found in this park. Be sure to visit the Interpretive Centers that are located in the area!
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http://www.tripleblaze.com/trail.php?c=3&i=6844