505 NE Grand Ave., 503-235-7529, theplaygroundgym.com.

Another rainy day inside and the rugrats are climbing the walls? Maybe they just need a few hours of parkour. The Playground Gym's flagship facility puts older children through relatively rigorous courses, from martial arts to circus training, while tykes are encouraged to find their own bliss across the indoor treehouse, climbing ropes and 1,400 square feet of play mats.