Walk with your furry best friend along the dog-friendly Discovery Trail in Long Beach, first blazed by Lewis and Clark, and enjoy monuments to that historic coastal exploration. On the Long Beach portion of the trail, you will see a basalt monolith, a gray whale skeleton, and the 19-foot bronze sculpture known as Clark's Tree. You'll also be able to learn more about the trail through interpretive displays along the boardwalk. Metal sculptures (including dog sculptures holding litter bags) also line the trail. Just keep your pup leashed while on the trail.