From Cusco, you can hire a taxi or a rental car and go on your own to the national park where the hike to Humantay lake starts. You can also book a one day hiking tour from one of the many Cusco agencies.

Machu Picchu
First you have to reach Aguas Caliente. You can get there from Cusco by train or on foot. From Aguas
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This lake is sooooo pretty! I saw it while hiking to the Machu Picchu, on Salkantay trek. There are some day trips as well, but if you like hiking I definitely recommend going on Salkantay trek to see this lake!