Your sideways photo self corrects when viewer clicks on it, don't know why. Magic!
When viewed full screen the single track picture really conveys the feeling of solitude and beauty you are describing.
Several companies have plastic sprays but Krylon is easy to get.
Krylon Fusion for plastic spray can in Gloss Sunbeam #2330 andFusion Gloss Black #2321 might replicate 1980's Yamaha look. I googled "paint for plastic" while considering this for myself. Clean, alcohol wipe, 180 grit light sand to de-gloss then white base coat over your blue(krylon Fusion gloss, satin or flat,2320,2420 or,2518). Then spray color coats. Supposedly with good prep any plastic paint base coat gives a good flexible bond to plastic allowing use of a dissimilar color coat. I mention this in case right yellow not easily available in plastic-specific compatible paint.
Sorry for my paint ramble, kinda distracts from beauty of your shared Knik Glacier ride.
I can't master piccasa either despite Admirals helpfull posts.