Subject: My Holiday Adventures!
Dear [Friend's Name],
Thank you so much for your lovely letter! I had an amazing time during my holidays in [Country]. I explored beautiful sights, tasted delicious food, and even made some new friends. One of my favorite moments was visiting [specific place or activity], where I experienced [something memorable]. It was truly an unforgettable trip! I can't wait to tell you more about it in person.
Take care and see you soon!
Best wishes,
[Your Name]