The little ski hill I worked at here in N. California was small enough that you could see about everyone on the hill. We would just holler at or tell them to not do what they were doing. Kids skiing out of the poma lift line, jumping while on it etc. advise them it could derail the cable. If someone didn't listen, you could always catch them at the bottom there were only two lifts, so they had to come to you eventually.:) Snowboarders fit right in with us mountain bikers.