We hit the trail last weekend for an overnight backpacking trip in the Blue Ridge Mountains. The whole family went and I'm proud to say that the 4-year old hiked the entire 7 mile loop (minus maybe five minutes on my shoulders, ouch). Although, with day two being almost entirely uphill (and at times pretty steep) I'm not sure I'll get him to do it again anytime soon.
For anyone interested in the trail, here's a map of the area. We did the top-down hike by starting on the Blue Ridge Parkway and heading down the Cornelius Creek drainage and returning on the Apple Orchard Falls trail. We camped at the site near the lower parking lot and, although it's very close to the lot ,we didn't actually see anyone until the morning.