If you are looking for a fun family activity to do, you will love the easy hike to the old Salmon Falls Bridge (the hidden bridge). It is only visible when the American River is below 400 ft levels. The bridge was build in 1920 during the gold rush. You can still see some of the ruins of the small town along the side of the river. My family and I visited the historic site over Valentines Day weekend. Our kids 5 and 8 enjoyed it a lot. It was easy enough for both of them and