May around Seattle is a time of rhododendrons. They bloom everywhere in different shape and color. But for real lover I would recommend little garden on Whidbey Island. Meerkerk Rhododendron Gardens – is small, but saturated with numerous rhodo species and hybrids.
They also have some other plants. My beloved lilac, for example.
Coniferous
Apple-trees
The bee-plant (I always forget it real name, but bees love it a lot).
There are also shadowy ponds
and very mossy constructions.
