About a 10 minute walk uphill from the International Rose Test Garden is the Japanese Gardens. There's an entry fee (less than $10). The garden doesn't take up that much space - it's fairly compact. It took us less than an hour to wander around. Of course, we had just come back from Asia, where we saw a similar style of gardens that put these gardens to shame. There's lots of photo ops, with streams, a koi pond, bamboo, sand gardens, and traditionally styled buildings. Part of the garden is wheelchair accessible.