If you decide to book your return train yourself or decide to change your return time from that arranged by Peru Treks then unfortunately we wont be able to send a bus to meet you in Ollantaytambo and take you back to Cusco and we wont be able to offer you any refund on the unused bus service that we include in the price of our trek on the 4th day of the trek. When you arrive at Ollantaytambo there are many buses waiting at the station to meet the train. The price of this bus is about US$5 per person back to Cusco and takes around 2 hours. Alternative you can take a private taxi back to Cusco which costs in the region of US$50 per taxi which works out fairly reasonable if there are 4 of you. Max 4 persons per taxi.