JUST TELL ME WHAT TO DO, OKAY?

i'm in a play, and i'm the only one in the cast who knows the ending, and so i'm trying to improv myself into situations that will hurry along the plot, but the other actors have no idea what i'm doing. so they just look at me like i'm crazy. or ignore me. that's my favorite.
What do you do when you know the ending but you have to fill up two hours of getting there? and your co-star didn't read the whole script before coming on stage?
cool. I'll just try not to ruin everything and wait for the director to tell me what i'm doing wrong.

yeah, that's sounds good.