The 3,500-foot vertical climb from Boise to Bogus Basin is one of the gnarliest in the Treasure Valley, taking riders from the baking sunshine of the flats and naked hillsides to the treeline. It's not for the faint of heart, but for 44 years now, the strong of will have participated in the annual Bogus Basin Hill Climb. This year, in addition to the road climb, the ride features a brutal alternative: a 21-mile mountain bike course, which is five miles and 500 vertical feet over the Bogus Basin Road route. Entry is $70 in advance, $100 the day of the race, and proceeds benefit the nonprofit recreation area and trail maintenance, which has a goal of $25,000. Whichever course you choose, there are rest stations along the way and a Music on the Mountain party waiting for you at the finish line.