Just Google translate some common Spanish phrases pertinent to your situation, and stick them on a small piece of paper in your wallet.

This is private property = Esta es propiedad privada.
You need to leave now = Tienes que irte ahora..
I will give you a free subscription to Pond Boss if you never return = Te daré una suscripción gratuita a Pond Boss si nunca regresas.

You know, normal things like that.