回答
ご質問ありがとうございます。
上記の回答は「遠足」の英訳です。そして、KO様の日本語を下記に英訳します!
On today's excursion, I climbed to the middle of the mountain without going to the summit.
On today's trip, I went up to the middle of the mountain and came down, without going to the top.
On today's hike, I walked up the mountain but came down without going to the summit.
ご参考になれば幸いです。