There are 4 main Bike Paths along SoCal Beaches:
1) Santa Monica, through Venice, to Marina Del Rey,
2) Playa Del Rey thru Manhattan Beach, Hermosa Beach to Redondo Beach,
3) Long Beach to Belmont Shore, and
4) Bolsa Chica thru Huntington Beach to Newport Beach.
(From Redondo Beach, you can bicycle to San Pedro around Palos Verdes Peninsula, or inland via PCH (Pacific Coast Highway) or other streets, or you can skip to Long Beach to start the next stretch of Bike Paths.)
laBikePaths.com shows the bike paths in LA and Orange County.
You can download a Bike Map for LA County (or Here).
Read a OC Metro article on Biking in Orange County.
Mile by Mile Guides outline from Capistrano to Malibu what you will see at each major point.
There are no Bike Shops in Corona Del Mar.
The Closest Bicycle Shops are in Newport Beach and Laguna Beach:
Bikes & More
2823 Newport Boulevard, Newport Beach, CA 92663
4525 West Coast Highway Suite A, Newport Beach, CA 92663
Let It Roll Bike Shop
3130 West Balboa Boulevard, Newport Beach, CA 92663
240 Thalia Street, Laguna Beach, CA 92651
Laguna Beach, CA 92607