If you visit the WA Arboretum, you must visit Foster Island which is within walking distance of the Arboretum parking area. We visited both locations for a total time of approx 4 hours.
If you have time, I would strongly suggest both, but in the summer its likely to be mosquito ridden in the marshy areas. Beautiful views, none-the-less of Lake Union, Univ of Wa and the Cascades.
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