Friday & Saturday, September 1 & 2: Wilcox Health Sports & Fitness Expo.  Savvy fitness enthusiasts and families from all over the U.S. and several countries will gather on Kaua`i to see and sample the latest in athletic footwear, apparel, fitness equipment, nutrition, and cross training prior to experiencing The Kaua`i Marathon and Half Marathon.  Grand Hyatt Resort & Spa, 1071 Poipu Rd., Koloa.  Friday 10 a.m. to 6 p.m., Saturday 9 a.m. to 4 p.m.