Queretaro is not one of my favorite places because I sprained my ankle really badly here and my couch surfing host was not so great, but the downtown area is beautiful and worth seeing. Find the Acueducto de Querétaro & Panteón and stroll on over to the Plaza de Fundadores & Templo de la Santa Cruz. The Alameda Hidalgo Park is a nice walk and very relaxing with a zocalo in the center. The Templo de Nuestra Sra del Carmen is beautiful and make sure to find an hour to see the MUCAL Calendar Museum which houses all kinds of ancient calendars from around the world. The Catedral de Queretaro, Parroquia del Sagrado Corazon de Jesus, Templo de Santa Rosa de Viterbo, Templo de San Francisco & Zenea Garden, Monument of the Corregidora, Templo de San Antonio Padua, and Templo de la Congregación de Guadalupe are all beautiful churches to check out. The Jardin del Arte is a lovely place to check out and relax with some live performances and and the Plaza del Armas is also really lovely. The wealthier people of this area live in Juriquilla which has a golf course and a lake and is a nice tranquil place to relax.
Find some time to see Tequisquiapan and lovely Bernal, pueblo mágicos nearby.