PUERTO VALLARTA (PVDN) - Puerto Vallarta is set to once again become the epicenter of trail running as it prepares to host the prestigious UTMB World Series from November 3 to 5. Known as a marquee event in the world of ultra-distance running, the UTMB (Ultra-Trail du Mont-Blanc) series gathers an international array of the sport’s elite athletes for a weekend of extreme competition amid the natural beauty of this Mexican tourist destination.