去 + (Location) + 爬山
爬山 (páshān) means "to climb a mountain" or "to go hiking." It is a verb-object compound that can be used on its own or with additional elements like destinations or time expressions.
周末我们一起去爬山吧。
zhōumò wǒmen yìqǐ qù páshān ba.
Let's go hiking together this weekend.
他每个星期天都会爬山锻炼身体。
tā měi gè xīngqītiān dōu huì páshān duànliàn shēntǐ.
He goes hiking every Sunday to exercise.
昨天爬山的时候,我拍了很多照片。
zuótiān páshān de shíhou, wǒ pāile hěn duō zhàopiàn.
I took a lot of photos while hiking yesterday.