You will write the letter in the present tense. Please include the following items in your letter: State which French-speaking country, or French city and when you are visiting.
Describe what the weather is like.
Share what two activities you, your friend or family members are doing.
Mention 3 things you are wearing and their color.

Hi ! So this is just an example but I hope it will help you :)

Je suis actuellement à Bordeaux, une ville dans le sud-ouest de la France. Il fait beau : il y a du soleil et il ne pleut pas. Je profite du beau temps pour aller me balader sur les quais et prendre une glace. Ma soeur reste à la maison et regarde un film. Je porte un t-shirt blanc, un jean bleu et des chaussures rouges.

Approximate translation :

I'm currently in Bordeaux, a city in south-west of France. The weather is nice : it's sunny and it's not raining. I enjoy the weather by talking a walk at the docks and taking an ice cream. My sister stays at home and watch a movie. I wear a white t-shirt, blue jeans and red shoes.

Hope that helps :)