A relativistic trip to Barnard’s Star? Those who read French will want to check out the log of such a journey as Philippe Guglielmetti sees it. Traveling at a constant 1g for acceleration and braking, the mission reaches 0.99999 c, travel time twelve years but only three as experienced by the crew. The fictionalized journey plays fast and loose with the star itself, as Adam Crowl notes in a comment below, but the trip is fun even with my rusty French. Have a look.