On the Lake

When we arrived to at the lake, everything looked different. There were a few people, not screaming or chatting too much, and there wasn't the noise of cars. We got out of the car and walked across a very thick wood very thinck, so thinck thick that inside it was almost dark. The dogs ran in front of us and jumped and barked, enjoing enjoying the freedom.
Some families ate, sitted seated near to the grills there that had been built to cook roasted meat. A man sitted sitting under a tree snored, his with red cheeks red because of the wine he'd drunk; a group of youngs were sitted seated on the back of a bench, making cigarettes.
Out of the wood, the view was free: the vast lawn, the lake and the mountais mountains all around, like a small world, protected and protecting.
"Ah! This is a pardise..." said Pino
"Sit down in some place. You have to relax yourself, my friend!
- Eat, drink and forget about the world for a moment, ok?"

A very enjoyable read, and only a few errors really. 

Just watch your prepositions: 'When we went to the lake' would be correct, but you would have to say 'When we arrived at the lake' (if that makes sense?!)

Also, the word 'sitted' does not exist; they sat, they were seated, they were sitting and, some might even say they were sat - you can play around with those!

Finally, your closing dialogue was not wrong as such, with the opening dashes: it's how the playwrights do it! In prose, however, English tends to favour quotation marks for spoken text.

I hope that was helpful - well done and keep writing! :-)

On the Lake

When we arrived at the lake, everything looked different. There were few people, not screaming or chatting too much, loudly and there wasn't much car noise of cars. We got out of the car and walked across through a very thick wood  very thinck, so thinck dense that it was very dark inside it was almost dark. The Our dogs ran in front of us and jumped and barked jumping and yelping in enjoing freedom.

Some families ate, sitted were picnicking near to the grills there built to cook roasted meat where the BBQ was taking place. A man sitted sat under a tree snored, with snoring away in his red rosy cheeks as he had a bit too much  because of the wine. drunk; a Then there was a group of youngsters were sitted smoking away as they sat on the back of a bench., making cigarettes.

Once out of the woods, the view was unobstructed free: the meadow was vast lawn, and the lake and was surrounded protectively by the mountains all around, like a small world protected and protecting. It is lilke a small world of its own.

"Ah! This is a paradise..." - said remarked Pino.

"Sit down in some place and take a respite. You have to Relax yourself, my friend!

Eat, drink and forget about the world for a moment, ok?.

When we arrived at the lake, everything looked different. There were few people, not screaming or chatting too much, there wasn't noise of cars. We got out of the car and walked across a wood very thick, so think that inside it was almost dark. The dogs ran in front of us and jumped and barked enjoying freedom.

Some families ate, sat near to the grills there built to cook roasted meat. A man sat under a tree snored, with red cheeks because of the wine drunk; a group of youngs was sat on the back of a bench, making cigarettes. Out of the wood, the view was free: the vast lawn, the lake and the mountains all around, like a small world protected and protecting.

- Ah! This is a paradise... - said Pino
- Sit down in some place. You have to relax yourself, my friend!
- Eat, drink and forget about the world for a moment, ok?