I am really glad that you and your family will be visiting Athens on Sunday. I am writing this email to suggest you some things.
Firstly, it would be my pleasure to meet you when you will arrive in my house, so we can start our day together. I am pretty sure that after the trip you would be hungry. So what about going to a traditional restaurant? There are many of these in the town centre and the food is delicious. You can tell me which is your favorite food and I will choose the best restaurant for you.
Also, we should choose what we are going to do this day. It is really hot these days, so we can go to the beach and play games like beach volley. After this, we can go sightseeing to the Acropolis and in Sounio. These archaeological sites are amazing and they have an incredible view, where you can see the sunset. At the end of our day, we can go for a walk in Plaka and you will not believe that you are in Athens but on an island.
I can’t wait to see you! Let me know if you agree with my suggestions.