At sea, the life is more nice

Last month, I had the opportunity of traveling to “Los Roques”. It is an beautiful archipielago ubicated located north of Venezuela. The view is incredible, because one can see the blue degration on the beaches, birds, sand, to  and also feel really close to nature. feel really the nature very near.

It was a funny weekend, we stayed at a pretty inn, the sun was shining all day and the air was pure. I visited some beaches, but the beach that I liked was “The tongue”, because one can see two beaches are close two different beaches that are very close to each other (I think that's what you mean). It is fantastic and unique.

I could see several kinds of turtles too. In fact some of them are endangered and while I don’t remember their names, but what I know is that one of them is  are used in order to produce carey.

Besides I could to do I also went snorkeling, and it was amazing. snorkel, it was amazing. The first minutes, I felt a little panicked, but then I was able to relax and I could enjoy how wonderful the sea can be / all the wonderful aspects of the sea. the wonderful of the sea.

I broadly agreed with Alex's corrections. Just a couple of points that I would add:

At sea, the life is more nice

A more 'English' way of saying this would be: "Life is nicer by the sea". "At sea" is for when you are in a boat or a ship and actually out on the water. If you are mostly on a beach, you would say "by the sea".

one of them is used

Actually, I would agree with you here! You said "one of them", and that is singular, so the verb should be "is". I am sure Alex would agree - it might just have been the word "them" causing the autocorrect function to change the verb to the plural. But "one of them", because of the "one", is definitely singular.