Nice walking routes through city of Houston proper

Hi! I'm a college student from Boston visiting Houston for a week. I love to walk around cities on foot and explore the urban centre very thoroughly. What are some nice neighborhoods or routes (eg. X landmark to Y landmark) to walk through? I enjoy walking for several hours, so I don't mind walking through many neighborhoods so long as the walk gives me a good sense for what the city of Houston (ie. not random suburbs) feels and looks like. Thank you 🙂