心旷神怡 ------ feel on top of the world

例句：
A: How do you feel about the sunrise of Mt. Ai?
你觉得阿里山的日出如何？
B: It's sofiantastic. I feel on top of the world.
真是太棒了。我感到心旷神怡。

同义词：
be in fine fettle
be in good spirits
get out of bed on the right side