My all-time favorite redwood grove is along the north Bull Creek Flats Trail in Humboldt Redwoods State Park. From San Francisco, drive north on highway 101 for about four hours, and then take the scenic route: the iconic Avenue of the Giants, where towering trees line the road through the park.
My favorite redwood park would have to be Humboldt Redwoods State Park. I grew up visiting it every summer as a child and have extremely fond memories of hiking and biking there with my dad. We camped nearby in Myers Flat at the Giant Redwoods RV Camp and went into the park each day for a different activity.