Yesterday I went for a hiking with a friend.

Yesterday I went hiking with a friend.

I didn't went for a hiking since a while so I really enjoyed it.

I hadn't gone hiking for a while

We saw differents lakes (five exactly), they were incredible.

different

We walked duringfor seven hours and we did 15 kilometers but it was worth it because the view was really nice!

I would really like to go for an other hikinge because it's outlandish (I confess I searched this word in internet :/)doors and it's really quiet and calm because there is no one around.

You felel free when you see the mountains and the animals.

I recommend it!

Yesterday I went for a hikinge with a friend.

either "I went for a hike" or "I went hiking" will work

I dihadn't wbeent for a hike ing since a while so I really enjoyed it.

We saw differents lakes (five exactly),; they were incredible.

We walked duringfor seven hours and we did 15 kilometers, but it was worth it because the view was really nice!

Also, I was shocked by my physical condition because it was not that bahard.

hard is associated with physical effort; probably the word you want here

I would really like to go for an other hikinge because it's outlandish (I confess I searched this word in internet :/) and it's really quiet and calm because there is no one else around.

outlandish doesn't work here...if you can give some other words that are close to what you're looking for we can try to find a better fit.

You felel free when you see the mountains and the animals.

I recommend it!

Yesterday I went for a hikinge with a friend.

Alternative: Yesterday I went hiking with a friend.

I didhaven't wbeent for/on a hiking sincee for a while, so I really enjoyed it.

You have to use "FOR a while," so I suggest changing "for" to "on" to avoid repetition

We saw a few differents lakes (five exactly), they were incredible.

We walked duringfor seven hours and wea didstance of 15 kilometers, but it was worth it because the views wasere really nice!

Since you saw different things on your hike (e.g., 5 different lakes), you'd use the plural "views"

I'd really like to go for an other hikinge because it's outlandish (I confess I searched this word inon the internet :/) and it's really quiet and calm because there is no one.

Although "outlandish" can by definition mean "far from civilization," the default meaning is "bizarre." Reading this, I would actually first think that you mean to say you enjoy it because it's a little crazy. But if you mean you enjoy it because it is far from the city, I would suggest saying something like "because I like being out in nature." This is mostly to help you be properly understood

You felel free when you see the mountains and the animals.

I recommend it!