Napa Valley’s First Trail 50k! Join us in Calistoga for the Napa Valley 50k, in glorious Robert Louis Stevenson State Park. Don’t let the name fool you — this is a challenging race that rollicks across the Palisades on rarely run trails, not a day at the spa. Want to know more? Read Penny MacPhail’s review, which starts, “I’m sorry but I can’t stop myself unleashing a recap of yesterday’s extraordinary race, Scena Performance’s inaugural Napa Trail 50k. It was…