What is the main idea of spring outing in Qiantang River?

The whole poem takes the word "travel" as its conception, just like a short and pithy travel note. On the way from Gushan and Jiating to Hudong and Bai Causeway, the poet enjoyed the paradise-like beauty and enjoyed the singing and dancing of birds and flowers. Finally, he walked back step by step along the white sand embankment under the shade of willows. My ears are still echoing the hymns of spring played by all things, and beautiful poems full of the interest of natural integration flow in my heart involuntarily.