I would suggest that if you are as far south as SF that you ride east across the San Joaquin valley and ride thru Yosemite park, taking Tioga pass over the sierras. From there you could either go across the desert (Utah and Colorado) or go north up to I-80 then heads east.

05 speedmaster - 1100cc, 11:1 racing pistons, Carillo rods, thunderbike cams, ported and polished head, 2mm over intake and exhaust valves, Barnett kevlar clutch, scepter pipes, oversize manifolds, 45mm HSR's, TTP stage 4 firestarter