How do you say

We plan to travel next month. Do you want to come along?

..in Chinese?

我们打算下个月去旅行,你有兴趣一起吗?

wǒ men dǎ suàn xià gè yuè qù lǚ xíng , nǐ yǒu xìng qù yì qǐ ma ?

How do you say "He will win the marathon in three months." in Chinese?