I am somewhat confused about these two places. Or, are they the same place? My husband and I will be in Aquas Calientes for two nights in early April .We enjoy hiking and were considering walking up to Machu Picchu. In addition, we were interested in a trek from the Machu Picchu site while we are there. Is it necessary to hire a guide to take the trek from the Macchu Picchu site? Any help would be appreciated. thanks!