How do you say

I have an appointment to travel with my friends in a month.

..in Chinese?

我和朋友约好了一个月后去旅行。

wǒ hé péng yǒu yuē hǎo le yí gè yuè hòu qù lǚ xíng 。

How do you say "My friends and I are planning to travel to New Zealand this summer." in Chinese?