I feel a little ambivalent about the Children's Arboretum; with a little investment it could be great, as I suspect was always the intent. As is, it doesn't do much to address the needs of its eponymous audience.
5am to midnight every day. That said, arboretums are more interesting when there are leaves on the trees.
If you find any factual innaccuracies in this post, please email me via richard at thingstodoinportland dot org so I can fix it for everyone. Thanks in advance!
10040 NE 6th Dr, Portland, OR 97211 [Google map].