I'm happy.

我很高兴。

I'm ecstatic.

我高兴得忘乎所以了。

I'm thrilled.

我太激动了。

I feel so happy.

我非常高兴。

I'm in heaven.

我好像到了天堂。

I'm in a good mood.

我心情很好。

I jumped for joy.

我高兴地跳了起来。

On the trip to Hawaii, I was in high spirits.

在去夏威夷的旅途中，我很开心。

I had a great time in the party.

聚会时我玩得很开心。

I had lots of fun at the fair today.

我今天在游乐场上玩得很高兴.