How do you say

My family plans to go on a summer vacation to the seashore.

..in Chinese?

我们全家计划暑假的时候去海边度假。

wǒ men quán jiā jì huà shǔ jià de shí hòu qù hǎi biān dù jià 。

How do you say "This dress became small after a month of wear." in Chinese?