if yer on a big twin, yer gunna want to stick to Soda Lake road. It's dirt but it might as well be a highway. There are some sandy bits but nothing super tricky.
What is your range? You are going to need to make sure to gas up in Frazier Park or Taft because it's at least 40 miles across the monument and no gas very close.
If you have never done it, I highly reccomend Little Tigunga cyn out of Sunland (off the 210) to Sand Cyn --> Vasquez Cyn --> Bouquet Cyn --> Spunky Cyn then make your way over to Frazier Park, gas up and take the one road heading west..... some of the best twisties around. Where that dead ends is right next to soda lake road. When you head back, take Hwy 58..... freaking beautiful out there
near Frazier Park
Soda Lake Road
oh yea and bring a camera