Bill,
1, 2, and 3 are all nice routes (with some modification).
From Santa Clarita, take Sand Canyon/Little Tunjunga to Burbank. Much better than paralleling 5.
From Maricopa, take 166 W to Klipstein Canyon. That runs into Hudson Ranch road which goes through Pine Mountain Club and Gorman. I'd strongly recommend the old ridge route from 138 to Santa Clarita. Closed to cars, not too rough, very nice. If you do want to continue down N3, both San Francisquito and Bouquet canyon are very nice. You could continue to Angeles Forest Hwy, but then you have to ride through part of Palmdale (not that great).
If you take 166 to 33, Pine Mountain summit is great down to Ojai. I wouldn't go to ventura; instead, take 150 E to Santa Paula - saves you a lot of ugly riding through Ventura.
Another good way to go is to take 33 to Ventucopa, and then take Quatal canyon up to Hudson ranch road to Gorman. Quatal canyon is dirt, but has a reasonable grade. I'd recommend a minimum of 40 mm tires.
Note that all of the routes go to 5000+ feet, so watch the weather.
Larry