There is a through train from the airport to the railway station. . It's not very expensive to take a taxi. It's estimated to be more than 20 yuan. There is a place to store luggage in the railway station. I suggest you go to the railway station first, and then look around. But it's hard to play for more than ten minutes, and there's nothing interesting in downtown Kunming. You can go to the nearby sauna for a massage. Or eat something near the train station and buy some special products or something.