I explored the Rainbow Mountains (also called Vinicunca) & the Red Valley with a private tour company from Cusco named QORIANKA TOURS.
This has been my favourite guided tour in South America, so I absolutely recommend it!
The tour price was 100 USD/pax including transportation, breakfast, lunch and a private guide, an incredible deal for what you get!
The day started at 4 am, when we left Cusco and drove for two hours to get to the breakfast place, where we ate all kinds of delicious Peruvian fruits.
Hiking the Rainbow mountain takes two hours, it is not so hard but that will depend on your physical condition and how your body reacts to the altitude. The first part of the hike is flat only the last half an hour gets steep, but you will get completely rewarded by the incredible views!
During the high season, the Rainbow Mountain receives more than 1,500 visitors per day, becoming one of the most popular destinations in Cusco. However, if you continue the hike for 30 minutes (on the left side of Vinicunca) you will get to a hidden gem called the Red Valley.