Keep an eye out at Mayorista Market — you're likely to discover some treasure or trinket in one of its many stalls. After you've had a thorough browse of things, grab a bite to eat from one of the nearby food vendors.
This community marketplace in Huancayo is popular with travelers, so make a spot for it on your must-see list. However, don't end your sightseeing there. There are plenty more spots ready for you to experience after Mayorista Market. Plaza Constitucion, Huancayo Cathedral, and Virgen Inmaculada de la Concepcion are nearby.