Translation of "Delightful" in Chinese

We've had a most delightful day.

我們過了最愉快的一天。

When a friend comes from afar, is that not delightful?

有朋自远方来，不亦乐乎？

It is delightful to be praised by an expert in the field.

被那个知识领域的专家夸奖真是高兴啊。