Okawa Onsen Takegasawa Park in Shizuoka Prefecture is a great place to appreciate the bioluminescent glow of fireflies during early summer. The annual firefly viewing event takes place from late May to early June, and visitors can also enjoy food booths, local produce sales, and toy sales during the event. The park is usually free to enter, but during the firefly period, there is an entry fee of ¥300, which goes towards preserving the firefly’s habitat. It’s a great opportunity to support a worthy cause while experiencing the beauty of these magical insects.