There are two ancient sites quite close to each other that you can see on a combined tour with either a bus or quad bikes. Moray and Maras are interesting sites to see if you need to fill extra days in Cusco or want an activity other than hiking.
Moray is an Inca archaeological located about 50 kilometers away from Cusco. It features several terraced circular depressions, with the largest one being around 30 meters deep. The purpose of these structures is still a bit of a mystery, but their design creates temperature variations that could have been used for agricultural experiments.