R.K.
Portland Parks & Rec have locations with open gym (called indoor park) for kids during the week. They usually charge $.50 or $1.00 per child. Lots of toys, little tykes cars, trampoline, etc. I've gone to it at the East Portland Community Center. Each location has their catalog of class & indoor park times online. http://www.portlandonline.com/parks/. There is also the Children's Gym in Milwaukie. www.childrensgym.com. There is Sunburst Gymnastics in Clackamas. http://users.easystreet.com/gyms/index.html. My daughter has also been to a birthday party at the Little Gym in Lake Oswego.