A plot is basically what's going on in a story, the main events in a story. In an action movie, there could be a murderer lurking around and the cops step up to stop him.
The plot is a murderer lurking around and the cops work to stop him.
The plot for a perfect day would probably me just being alone. I enjoy my alone time, and it'll allow me to get my own plans done, and not my plans getting ruined because of someone else's plans.