Prospector is a very fun trail off of the Lumberjack lift.
With several pitches that have small rolls, this is still very easy for a beginner, and gives them a feeling of what a blue would be like without quite the steepness.
There are tree islands and other obstacles on this relatively wide slope that is just perfect for the beginner.
This area is one of the prettiest, with beautiful views and a feeling of total isolation from the rest of the mountain.
Copper has one of the best assortments of easy green trails in the country in the Union Creek area.