Cruza la plaza/ Cruce la plaza Both sentences are in the IMPERATIVE TENSE, but the first one is more informal, and the second one is formal (tú y usted) "
Cruza la plaza, gira (girar) a la izquierda, sigue (seguir) derecho y finalmente voltea (voltear: turn) a tu izquierda.
Cruce la plaza, siga caminando al frente/siga caminando hacia adelante (keep walking foward), gire hacia su derecha y luego vaya (ir) hacia atrás(move back).
My namesake up there is right too. In argentina the people use another conjugation for the second person Imperative. (cruzá, girá, mirá, seguí)
Have a nice day Vika!