Sun Run: La Primera is the opening event of the Running Shop/Mizuno SAR Grand Prix Series, held at Danny Lopez Park. Participants run a scenic loop along the Santa Cruz River Path, featuring gently rolling hills through the Sweetwater Riparian area. The event includes races for adults and a FitKidz Mile for children. The course offers a fresh challenge compared to traditional out-and-back routes. Proceeds from the race support the Gratitude and Grace Foundation, which assists families recovering from organ transplant and substance abuse disorder.