The trailhead is between the lab and the first of the white dorm cottages. It's marked by a green sign -- simply follow the short trail to the access road at the top of the ridge. The trail switchbacks along the face of the hill, where there are great opportunities for geology (lots of volcanic rocks) and viewing lichens.
Once you reach the top, you can follow the access road to the left to look for birds on the sewage treatment pond -- there are sometimes ducks (usually mallards) and an occasional spotted sandpiper during migration. The road dead-ends at the pond, but you can walk farther down the hill to explore some great tide pools. Be careful -- it is steep in places and at high tide can be washed by waves.
There are a number of places with lovely views of the isthmus and the mainland. Just where the access road makes a horseshoe bend, there is also a view of Empire Landing, a small settlement on the island where there was a stone quarry for many years.
This short hike is one of my favorite leg-stretches during a work day!