道遊の割戸とは、露天掘りで真っ二つに割られた山のことですね。
そこ自体は「マビノギのアルビダンジョン入り口みたいだなー」という、ゲームをやってない人にはなんのこっちゃな感想でした(笑)

アイスは金箔をまぶしたスジャータでした！
おいしかったけど、スジャータはどこの地に行ってもスジャータなんで、ぼくはあんまり食べませんねー。
ご当地ソフトを食べるのが楽しみなので！

"Dōyū-no-Wareto":http://sadoaikawa.info/spot/contents.php?lang=en&sid=31 is a mountain split in two by strip mining. I could describe it as resembling the entrance to Mabinogi's Alby Dungeon, but I imagine people who've never played the game would wonder what the heck that means. :-)

The ice cream was "Sujahta":https://www.sujahta.co.jp/English/products.html brand sprinkled with gold foil! It was delicious, but Sujahta is Sujahta no matter where you go, so I didn't eat much of it. I enjoy eating local soft serve!