Don't forget to occasionally look down, east, into the valley of green wilderness. Take a right at the Fern Trail, which descends to the Stream Trail. Don't expect to see any, but the Ranger confirmed with me that a small population of rainbow and steelhead trout survive in the water, someplace. Turn right at the Stream Trail and continue beneath the Redwoods to the Lupine Trail. Take a left, cross a bridge and start heading uphill a little.
Lupine lasts for a bit less than a mile in low trees, mostly under the sun.
Since you're now on a ridge at the opposite side from the French Trail, enjoy some more valley views to your west. Descend back to the Stream Trail, take a left and head back to the car. 580, take Hwy. In Oakland, take Hwy. 13 heading south.