This is from the Arboretum at UCSC, not sure what's up with the glow... camera issues.
Leaves are dark green, 1/12" to 1/4" long however on elongating stems they may be 1/2" long. Lateral leaves keel-shaped wrapping around the stem, the facial leaf bases covered by the lateral bases. On elongating stems you can easily see the decurrent leaf bases, hence the name of the plant.
Tips of the leaves reflexed from the twig. Fragrant when crushed, persisting 2 years before falling off and leaving a reddish stem.
Female cones 3/4 - 1" long, ovoid to oblong shaped, light brown at maturity, with 2 sets of scales (only one fertile) that reflex back leaving a central stalk. Pretty distinct. Have had a hard time finding them around here, but found some great ones at Harvery West Park. Not round like so many others in the family, and more like Thuja cones.
Bark is spectacular, especially on older trees.
Several cultivars 'Argentomarginata' and the below is 'Maupin Glow'.
Misidentification: Others like Thuja plicata which you will not see much of here, Chamaecyparis lawsoniana which is pretty common. When you pull of the end of a small shoot you will see 4 leaf tips and not 2 like Thuja, Chamaecyparis or Cupressus. Also look for cones, which I am not seeing so that might not help. Chamaecyparis lawsoniana has little translucent glands in the leaves and little round cones.