Ashikaga Flower Park
At Ashikaga Flower Park, you can enjoy the sight of all kinds of seasonal flowers, which adorn the park according to eight themes: "Early Spring", "The Spring Flower Festival", "A Tale of the Wisteria", "Rainbow Garden", "Blue and White Garden", "The Flower Faeries Who Float By the Water", "Purple Garden", and "The Garden of Illuminated Flowers". The park is a popular location, enjoying not only local visitors, but those from abroad.
If you're visiting Japan from mid-April to early May, I highly recommend adding Ashikaga Flower Park to your itinerary. It's just outside Tokyo and the wisteria season is absolutely magical and romantic.