that side, over there

I go over there.

私はそちらへ行きます

I go over there to look for something.

私は品物を探すために、そちらへ行きます

I go over there with my friend to look for something.

私は品物を探すために、友達とそちらへ行きます

I go over there with my friend at the weekend to look for something.

私は品物を探すために、友達と週末にそちらへ行きます

I go over there with my friend by subway at the weekend to look for something.

私は品物を探すために、友達と週末に地下鉄に乗ってそちらへ行きます