Holiday
noun
When you have a rest day you have a holiday.
きゅうじつ
This is a jukugo word, which usually means on'yomi readings from the kanji. Since 日 has two on'yomi readings, here's a mnemonic to help you remember which one to use: Every holiday, you eat not one, but two cucumbers. Gee, two (きゅうじつ)? Take it easy!
休日はワインをのみます。
I drink wine on holidays.
今日は休日なので、ピクニックにきました。
Today is a holiday, so I came for a picnic.
休日にメールしてこないで下さい。
Please do not email me on my days off.