So we did the hike from AC to Mandor. We took the bus that usually goes up to MP but we bought a $5 ticket and it dropped us off at the museum which saved us about 20 minutes. We followed the train tracks to Mandor. BTW, we saw some well covered trails and bridges, probably Incan. We did the falls and came back to the way station there where they fixed us a nice lunch for 14 soles.
When we hiked back to the museum, some people grabbed taxis to get back to the hotel in AC.