Less a museum and more of a series of very well designed thematic play zones, Portland Children's Museum offers a lot of fun and variety, especially for smaller children.
As far as we know, this location is temporarily closed but has plans to reopen in the future.
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!
4015 SW Canyon Rd, Portland, OR [Google map].