It seems okay, but the real trick is aligning the days with the blossom's full bloom in the cities.If you are trying to plan a "cherry blossom itinerary", then I would skip Mount Koya, because it's not a great place for cherry blossoms. Instead, you should go to Yoshino, which has a long history of cherry blossom viewing and it has more blossoms than any other place in the nation.
Perhaps you just want to visit Mount Koya out of personal interest rather than to see cherry blossoms. In that case, it's a great place.
