Anchor: But it is well worth a visit to the top (a short hike from the bus stop) to peer down into the bleak, barren crater emitting puffs of sulfurous fumes and contrasting starkly with the colorful vegetation all around it.
Entailed: It is certainly a good opportunity to visit the top.
Contradiction: The bus stop is not located at the top.
Contradiction: The man is riding a pony.
Contradiction: Tuppence thoroughly examined it. 
Contradiction: Something cold and dry ran down his leg.
Contradiction: A group of people on a boat