Cairo has water bus system along the nile. 5 egp for slow river journey maadi to giza with stops at university and other points.

Takes 90 minutes versus 30 by metro but you get nile views, river breeze, different city perspective. Boats basic but clean, every 30-45 minutes during daylight.

Perfect if staying maadi and want scenic route to giza area. Check schedules locally - irregular fridays.