The Rainbow Mountain tour is one of Cusco's most requested full-day hikes. It starts before sunrise, continues toward the southern highlands and includes a high-altitude walk to the main viewpoint of Vinicunca. It is a strong option for travelers who want a landscape-focused day, but it should not be rushed if you have just arrived in Cusco.
This is a high-altitude hike. Consider doing it after acclimatizing in Cusco and bring warm layers.