1) While you could certainly call it a "sightseeing bus", I hear it much more commonly referred to as a tour bus. 2) You could say that, but it is a bit "wordy". I would probably instead say "I am going to travel around the city in a sightseeing/tour bus." 3) This sentence is fine, but it seems a bit strange that the verb "ride" comes first in this sentence. It seems to imply a bit that you must be on the ship in order to enjoy the scenery. If it is merely an option I would switch the verbs like so: "I will enjoy the scenery in the city by viewing it from a boat" or "I will enjoy the scenery in the city while riding/on a boat" Hope this helps :)

1) Yes, it is called a sightseeing bus or sometimes a tour bus. 2) Yes, you can say that. However, you don't need to say "to travel" because that is obvious and redundant. I am going to ride a sightseeing bus around the city. 3) Yes, you could say "ship", but a ship is a boat, so it means you are riding a boat along the coast or around the city. And you don't normally use "scenery" with "city". You could say "skyline". You can use "scenery" to talk about the mountains, beaches, valleys, etc. I am going to ride a ship to enjoy the skyline of the city. I am going to ride a ship to enjoy the scenery of the coast.