This is a history museum.
This is a stunning cathedral in the heart of downtown.
This is a very large garden in the heart of downtown next to the cathedral which is also listed and there are restaurants in the area.
If you want to explore out of San Miguel, a nearby city of Guanajuato has great food, very affordable but beautiful jewelry mined right in the city and art. Guanajuato is known for their silver, gold, opals, and cultured streets.
This is a colonial/modern nearby city with beautiful art museums and wineries.