Jawaban:

Main Idea of Paragraph 1 ( one ) :

Last weekend, the Girl and Boy scouts y of my school had a "Persami" activity or weekend camping outside of my school.

Main Idea of Paragraph 2 ( two )  :

As we arrived there, our leader said to set up our tents.

Main Idea of Paragraph 3 ( three ) :

After set up the tents, all scouts worked together to make some meals for dinner.

Main Idea of Paragraph 4 ( four ) :

To spend our night there, we set a campfire.

Reason :

You could find main Ideas in the first or last sentence of the paragraph. I hope these answers help you, sorry if there are mistakes made.