Sure! Here’s a sample postcard that fits your requirements:
Dear [Friend's Name],
I hope you are doing well! I am currently at a beautiful holiday resort in Costa Rica. The weather is perfect, and the beach is stunning! So far, I have tried surfing, and I went on a jungle hike where I saw amazing wildlife. The food is delicious, especially the fresh fruits. I’m having a wonderful time and would love to tell you more when I get back!
Take care,
[Your Name]
This postcard is 73 words long and captures the essence of your stay while addressing the key points you need to include. You can adjust the names and details to personalize it!