http://www.jimmys-adventures.net/best-hiking-southern-california/

Avalon’s dirty little secret: its beach is health hazard
Visitors to the island often ignore the warning, but some in town want to take action. By the hundreds of thousands each year, they sail to Avalon by ferry and cruise ship for diving trips, glass-bottom boat tours and to lounge on the beach in the Catalina Island town 26 miles off the Southern California coast.
Best Place for Hiking and Mountain Biking in Tarzana