Bold answers:
Dear Fabián: This week, my parents (1)are in Bayamón, Puerto Rico. Tomorrow they will take a train. (2)It will take them to San Juan where they will spend another week. My brother and I (3)are staying at my aunt Sandra and uncle Ramón's house in the countryside and we are a little (4) bored here. I take pictures each day, but my brother doesn't (5) look at them. He is (6) upset because he wants to go back to the city to see his friends. Today, it is (7) hot and tomorrow it will be cold. I (8) am by the pool relaxing. It is (9) a lovely day! Your friend.
Translation:
Dear Fabián: This week, my parents are in Bayamón, Puerto Rico. Tomorrow they will travel by train. It is going to take them to San Juan where they will be another week. My brother and I are in the house of my aunt Sandra and my uncle Ramón in the country and we are a little bored here. I take pictures every day, but my brother does not look at them. He is angry because he wants to return to the city to see his friends. Today, it's getting hot and tomorrow it's going to be cold. I am by the pool, resting. It is a beautiful day! Your friend.