可数，但是on my holiday和on my holidays常通用。例句：This is a great holiday resort that is full of life.这里生气勃勃，是一个绝妙的度假胜地。
例句
1、You'll need ￡ 200 minimum for your holiday expenses.
你需要200英镑作为你假日的最低开销。
2、The school will be closed Monday because it's a holiday.
星期一是公共假日，所以学校不上课。
3、I've got three days' holiday including New Year's Day.
包括元旦在内我有三天假。
4、We won't get another chance of a holiday this year.
我们今年不会再有机会度假了。
5、The package includes 20 days' paid holiday a year.
这一揽子福利包括每年20天的带薪假。