How do you say

I intend to buy a pair of shoes to wear for a month.

..in Chinese?

我打算买一双鞋穿一个月。

wǒ dǎ suàn mǎi yī shuāng xié chuān yí gè yuè 。

How do you say "My friends and I are planning to go on holiday to Hainan in three months time." in Chinese?