Several friends and I will be in Cuzco for 3 days prior to doing the Salkantay Trek. Is it better to join a one day tour of the Sacred Valley, or just get a cab and see the sights on our own over a period of 2 days? Is one day enough time to take in Pisac market/ruins, Ollantaytambo, Chinchero, etc? We will be arriving in Cuzco on a Sunday---mid-morning unfortunately, so, we won't be able to do the more preferred full day tour of the busier Sunday Pisac market. So, we've decided to do it on Tuesday instead but that still leaves Monday open to split the Sacred Valley into 2 days. Suggestions?