Very cool pics. The rainbows reminded me of the time I got to look down on a ground to ground, full arc, double rainbow. Was camping on the peak of a 13,000' peak in North Grand County, Colorado at a Forest Service radio cabin with four lightning rods around it. Two thunderstorms passed on either side of us and created the double arc-er in the valley below us. To that point I had only ever looked up at a rainbow. Thanks for the re-memory.
If you look at the Houston Brothers trail segment you'll notice that this second link routes down FSR 139 where the trail crosses over. If you're getting tired or running low on time when you get to that point I'd recommend the fire road option, that last section of trail has a bit of hike a bike to it.