You can also keep a day to visit Sarnath, a place where Gautam Buddha first taught Dharma after his enlightenment. The place id just 12 Kms away from Banaras.
Eat litti chokha and sattu parathas at Puran Das Road, Dahi Bhalla at Deena Chat Bhandar, Lassi at Vishwanath Gali, and famous Paan (betel leaf with tobacco or lime but filled with fennel seeds (saunf), sweetened rose petals (gulkandand) and soft and chewy supari (beetle nut).
There is so much Varanasi can offer. Despite the small pathways and crowded streets, it will leave you in awe of the city with love and warmth that is offers.