There is a charge to enter this oasis ($6 for adults; $4 over age 65). Public guided tours are available on some days.
For a special experience, attend a Chado tea demonstration in the beautiful tea house. There is a minimal fee to participate in this cerermony, but you can view the demonstration at no charge.
The Gardens have variable hours, depending on the season and weather. For current information, check their website, which is attached to the Seattle Parks listings: www.seattle.gov/parks/parkspaces/gardens.htm