Beautiful park and wonderful hiking. When I lived in Oregon, this was always near the top of the list of places to bring out of state guests. Even if you don't do the whole hiking loop, going a mile or so brings you to several falls and through some lovely forest. Be sure to bring a camera.
A must stop if you're in the area. Great place to stretch your legs and cool off on a hot day by splashing in the water. You can climb all over the falls, which makes it a perfect spot for older kids or kids at heart. I've stopped here multiple times with vans full of teens and practically had to drag them out of the park.
One of my favorite places from childhood road trips. Dozens of caves to explore that were formed by ancient lava flows. Some are simple and walkable with small kids, others are intense, claustrophobic and will take hours to fully explore. Also some fun above ground hikes. History buffs should also check out the nearby Captain Jack's Stronghold and Tule Lake Internment Camp.
Great place to walk and explore. Educational markers help tell the story of a little known part of the larger history of American-Native wars of the 19th Century. The history and natural features make it interesting for all ages.
The imagination station is one of the best playgrounds I've ever seen. Had hours of fun here with my kids and nieces.
A must for nature lovers and tree lovers. The awe-inspiring immensity of the tree and serene setting make for a very spiritual feeling to the place.