This makes me sad because I moved to the Bay Area in 2021 and to me Big Basin is just a large burnt out piece of land. I spend a lot of time down there surfing and I don’t think the park has even reopened.
If you want a similar experience now, your best bet is to head north on 101 into the Redwoods State and National Parks system, visit places like Avenue of the Giants and Women's Club Grove. All north of Garberville. Spots along the road will all be crowded from now through September, but if you do some exploring of your own, you can still find some nice quiet places full of enormous trees.