Nagoya and Toyama

I will go to Nagoya city and Toyama prefecture for business trip next week,so i'm busy preparing for the trip this week.
Nagoya is a very big city. It has a population of over 2 million people in Nagoya.
It is said that a mirage is seen by the sea side in Toyama.But I haven't seen yet.

Nagoya and Toyama

I will go to Nagoya city and Toyama prefecture on business trip next week. So, I'm busy preparing for the trip now. (or I would be busy preparing for the trip all this week. It is always better to use "-ing" form of words for present continous tense.)

Nagoya is a very big city. It has a population of over two million ( all the simple numbers,i.e,upto ten must be spelled completely one for 1, nine for 9 and so on for simple contexts such as this one.) people. (Since already you mentioned It at the beginning of the sentence ,saying "in Nagoya" at the again is not required. It is understood.) It is said that a mirage can be seen by the sea-side in Toyama. (To be more clear to reader it is always better to say " mirage-of-what"  . Using some words in English such as mirage,search , etc would always expect a preposition like mirage of...something, search for ....something and so on. Omitting them may sound incomplete .

But I haven't see it yet. ( Here "it" is a must use pronoun again.!)

Hope it helps!!

ありがとうございます。