As an official stop on the Lewis & Clark National Historic Trail, we off the National Park’s Lewis & Clarks Junior Ranger Program. This program comes with J.R. activity booklet, and participants (geared for ages 7 to 13) will get a Junior Ranger pin after filling out the activity booklet. 1 hour. Meets in the rotunda. Free program thanks to partnership with National Park Service. Free booklets are also available at the front desk.