If there are no sidewalks, do you have to longboard on the left lane and move when on coming traffic is coming? (California)?
You walk/skate with the traffic coming towards you.
Call the CHP and ask them. They'll be glad to tell you the exact law on this. Use your common sense though, and don't demand right of way in contests you can fatally lose.
It is illegal for you to ride a skateboard on the streets. Period. The question is, do you care?