"Watch where you're going" In Spanish
Gracias,
Tim
3 Answers
¡Mira por dónde vas! or ¡Fíjate por dónde caminas!

Cuidate.
Both the answers you've got are correct, of course.
I often say "¡Con permiso!" if someone pushes past or bumps into me. It's sort of "Excuse me (or you, for that matter)!"