If you were up for a bit of a 'work out' there is a wonderful mountain drive between Porterville and Lake Isabella. You take the 190 past Camp Nelson to the Great Western divide highway. Watch out for the 'Trail of 100 giants', a little known gem of giant Sequoia trees, before turning left on M-50 [Parker pass] to Johnsondale. Take M-99 along the Kern river Highway to Kernville and around Lake Isabella. This is slow going and not for everyone, but we thoroughly enjoyed the scenery and the feeling of isolation. The roads are all paved and although twisty in places, we managed it in a 30ft RV. Worth considering depending on how you feel on the day.