M3 can be glimpsed in binoculars as a round hazy patch.  A 6-inch scope will reveal many hundreds of individual stars. Larger instruments will resolve this cluster to the core, showing a myriad of glittering points of light.  Look for chains of stars radiating outward from the center.  I like to point my Dob well to the west of the cluster and wait as it slowly drifts into view.  First a few faint stars appear sprinkled across the field, followed by ever more brighter stars until the entire field is filled with points of light, like sparkling diamonds.

It can be argued that perhaps with the exception of Saturn there is no view in the sky more stunning than a globular cluster, and this is one of the finest.  Unlike most other objects in the sky, no photograph can capture the beauty you will see in the eyepiece!  If you want to share the beauty of the night sky with a non-astronomer, a globular star cluster such as M3 will always delight and never disappoint.