How do you say

I went to Xiamen for a trip last month, and the beaches there were beautiful.

..in Chinese?

我上个月去了厦门旅行,那里的沙滩美丽极了。

wǒ shàng gè yuè qù le xià mén lǚ xíng , nà lǐ de shā tān měi lì jí le 。

How do you say "He worked out every day, and three months of intense marathon training had greatly improved his fitness." in Chinese?