日本...........

You can start with --- my favourite country is Japan, it is in------location-------. Population and some general information about the country.

Then describe the weather of Japan, and better tell which season would be the best to travel.

Next, introduce food like sushi and say they are yummy those sorts of things.

Then talk about tourist attraction like Disneyland, toyko tower. Describe the tourist attraction with details like which city, how big, when's built...

for others, I think talk some of the Japanese culture, which can be modern life some history as well.

conclusion, say because of the things above , i choose Japan as my favourite country.