Dear [Recipient's Name],

I hope this postcard finds you well! I'm currently in Nha Trang, enjoying the hot summer weather and reminiscing about the activities we did in the past. I've been swimming and playing badminton, just like we used to do together.

Next, I'll be heading to Da Lat for five days. I'm looking forward to visiting Prenn Calm, Than Tho Lake, and Love Valley. After that, I'll be visiting my sister and brother in Ho Chi Minh City. They are studying there, and I can't wait to catch up with them.

Finally, I'll be exploring the beautiful city of Hue for three days. The cool and warm weather of spring here is so refreshing, just like our walks in the past.

I wish you were here to join me on this adventure. I'll be sure to send you more updates soon!

Take care,
[Your Name]