Random wiki: Bellevue Botanical Garden.
Bellevue Botanical Garden (14.5 ha / 36 acres) is a botanical garden located at 12001 Main Street, Bellevue, Washington. It is open daily; admission is free.
The garden area includes display gardens, woodlands, meadows and wetlands. Its specific collections include: an alpine rock garden, dahlia garden, entrance garden, fuchsia garden, ground cover garden, Lost Meadow Trail (with western redcedar, Douglas-fir, bigleaf maple and vine maple, plus native shrubs), native discovery garden, perennial border, water-wise garden, and the Yao garden (a Japanese-style stroll garden with maples, viburnums, hydrangeas, etc.)
Add another thing to the list of places I'd rather go than Disneyland...