After seeing the railway model diorama at Itoigawa Station, I went to the Echigo Oshiage Hisui Kaigan Station, which opened in March 2021. From here, you can walk to the Hisui Coast in Itoigawa.
Hisui Coast
Google Map: https://goo.gl/maps/kGtd8xtc7inXNvj56