The cherry blossom festival is a cool experience to go to. I had never seen cherry blossoms, but was just beginning to play with a camera so it was a must for me. Besides look at the cherry blossoms along the beautiful area of Yeouido there isn't much entertainment for adults. You may be able to have fun and whatnot, but it is more geared toward couples looking for romantic strolls or families with their kids. There are people in costumes and cartoon characters to entertain them. I wouldn't recommend coming cross country to check this out. But if you are in Seoul you may as well stop by for a couple hours. Especially if you like photos because these babies only bloom for 10-14 days.