Other than the first month that Everest opened, we have always done the Safari first, and then headed straight to Everest afterward. And every single time that we have done that, (and I mean every single time), Everest has been a walk-on for our first ride, and either a walk-on, or a wait for the next train for our second ride. And we could have ridden a third time with less than a 5 minute wait each time. In my experience, the line at the Safari builds more quickly, so it is best to start there.