Pho is good but you can have other choices. There are some kinds of noodles we call "Hủ tiếu Nam Vang" which is also good as Phở. You can find it at "Liến Húa" (located at Võ Văn Tần street, distrcit 3.
If you are in Sai Gon you can also try "Cơm tấm" (Broken rice) at these : Mộc, Thuận Kiều.
these are special food to try