進去前先上好廁所，參見：
39. Does the ticket to Machu Picchu allow me to leave and return?
No. Only the ‘Machu Picchu + Mountain’ ticket allows you to leave and re-enter the archaeological site for the only time. The other tickets do not allow it. It is recommended to go to the restrooms before entering; in order to carry out the tour without urgency.
https://www.ticketmachupicchu.com/faqs-about-ticket-machu-picchu/#ticket-machu-picchu-leave-return