The Blue Loop Trail at Settler's Cabin Park in Carnegie, Pennsylvania is an easy 1.7 mile hike through the eastern portion of the park. This trail does not have any overlooks or sights, but is a nice hike through the woods outside of Pittsburgh. On the western side of this loop, the trail runs along the Green Loop Trail, so you'll find both blue and green blazes along this hike - just continue following the blue blazes to stay on course.
Waterfalls: This trail does not have any waterfalls, but there's a small 4 foot waterfall along the Green Loop Trail at Settler's Cabin Park. It's only about a 0.2 to 0.3 mile hike (one-way) from the southern intersection with the green trail.