The Natural Bridge does not involve much walking to get to the bridge, it's about a hundred stairs to get to the bottom and then a short walk to the bridge which you walk under. I think for the cost it's worthwhile to take the entire hike to the end waterfall, even though it's very far away and not easy to see. There is the Monacan Indian village along the way that has people doing various jobs who teach their craft. We found that very interesting. In total we walked 3.7 miles!