I finally bought a new hybrid bike that can handle paved and unpaved trails, so this weekend I tried some of the unpaved paths on the Des Plaines River Trail. But, as a novice cyclist, I made a few painful mistakes:I wore a tank top and not a cycling shirt. My backpack rubbed on my bare shoulders, and I quickly realized I needed the sleeves for extra protection from the sun.I forgot sunglasses. I left early and didn't think the sun would be that bright. But sunglasses are necessary to protect your eyes from branches …