There's plenty of fun, indoor play here for kids. We loved the garage (ages 5 and over) where older kids can drill, glue, draw and build their own creations. The water works is a great attraction for all ages (bring a change of clothes). A Dig Pit is filled with rubber "gravel," plus plenty of buckets, shovels, dump trucks and a conveyor belt, perfect for toddlers.
The Children's museum underwent a major update in 2011 (after my visit) that included refreshing many of the exhibits and adding a cafe. We'll look forward to checking it out on our next trip to Portland.