I'm with OM. Ex-Officio Give'n'Go boxer briefs are my go to for trail UW. they wick, they're comfy, and prevent chaffing. They also dry pretty quickly when you wash them. I've picked up about 6 or 7 pairs. REI and Backcountry.com have them for $26, but you can find them for less on sale.
Awwww...go take a hike!