Dear [Tên người bạn],

How are you? I hope this postcard finds you well. I'm currently having an amazing time in Halong Bay, Vietnam. The scenery here is absolutely stunning, with towering limestone cliffs rising out of the crystal-clear water.

I've been exploring the many caves and grottoes in the area, as well as taking boat tours and kayaking around the bay. The fresh seafood here is also a real treat, and I've been indulging in delicious meals every day.

I wish you could be here to experience it all with me. Perhaps we can plan a trip together in the future? In the meantime, I'll send you some more pictures and updates.

Take care and talk to you soon!

Best regards, [Tên của bạn]