A boat in which we go sightseeing is not usually called a ferry boat.Please check the following sentence.
You can take a ferry boat to go sightseeing around the harbor and enjoy the beautiful scenery along the river.
That's fine.You can take a boat to go sightseeing around the harbor and enjoy the beautiful scenery along the river.
If you have a question about the English language and would like to ask one of our many English teachers and language experts, please click the button below to let us know: