Post Independent file photo It might have been a toss-up as to which was the most popular opening day — Major League Baseball or the Hanging Lake permit reservation system. The Hanging Lake Trail in Glenwood Canyon proved to be as popular a destination as ever, attracting 7,500 reservations in just the first 90 minutes after the reservation site went live at 9 a.m. Thursday for the 2021 season. “We were getting about 20 reservations per minute at one point,” Lisa Langer, director of tourism promotion for the city of Glenwood Springs, said of the permit booking system, which is managed under contract by H2O Ventures. “Things began to slow some after that initial surge.”