I have just returned from a practice hike in which I tried to avoid sunscreen and protect myself from the heat by hiking with a large umbrella (or parasol.) I've read so much hype about this that I wanted to give it a try myself. Alas, the umbrella strategy was problematic. Perhaps I was hemmed in by my desire to see where I was going. Often, the umbrella blocked my view. Because of this, I was hiking blind most of the time, crashing into many foreign objects( bushes, rocks, trees, bees and so forth). For another, I could never figure out how to keep all of myself out of the sun's searing rays; at any give time, my ankle, neck or calves were getting barbecued from above. And finally, hiking with an umbrella looks silly, especially if your parasol is huge and pink with ugly racing stripes.
More later, but for now I would have to say "thumbs down on umbrella-hiking excursions.''