There was an interesting article about Japanese gardens today in the San Francisco chronicle. Osmosis, a Japanese Spa retreat in Sonoma County has some beautiful Japanese gardens created by Osmosis founder Michael Stusser after a garden apprenticeship spent in Kyoto.
For good local examples of Japanese gardens this may be a good place to visit. The garden is only open to spa guests, except when they have special events, such as concerts.
Making an authentic looking Japanese garden is not an easy task. I took a trip to Kyoto in 2001 and after seeing the real thing it is easy to spot imitators. Two of the better examples of Japanese Gardens are the Portland Japanese Gardens, and the San Francisco Japanese Tea House in Golden Gate Park.