Original sentence: It has a deck and takes people out to the sea.
Corrected sentence (better): It has a deck and takes people out to sea.
Even clearer sentence (use if you mean a boat): The boat has a deck and takes people out to sea.
Why this is better (easy words):
- We usually say "out to sea" when a boat goes away from the shore into the ocean.
- "Deck" is right — it means the flat part people stand on.
- Starting with "The boat" instead of "It" makes the sentence clearer about what you mean.
Short and simple: say, "The boat has a deck and takes people out to sea."