With a double right turn on the second intersection, sidewalk riding seems the least safe to me. The motorist will make that right turn from both lanes regardless if the light is green or red. Even if you get the motorist to stop for you in the right most right turning lane, the motorist in the left right turning lane is not likely to see you or stop for you.

Even the first intersection with no stop right turns exiting and entering the main road is a dangerous situation for sidewalk riding.