Dear John,

I hope this email finds you well. I am thrilled to hear that you will be visiting Vietnam this summer and I can't wait to show you around Ninh Binh, a province known for its breathtaking natural beauty and historical sites.

One of the must-visit places in Ninh Binh is Trang An Landscape Complex, a UNESCO World Heritage Site. Here, you can take a boat ride through the stunning karst mountains, explore numerous caves, and enjoy the tranquility of the surrounding nature.

Another famous attraction is Tam Coc, often referred to as "Halong Bay on land." You can take a boat trip along the Ngo Dong River, passing through rice fields and limestone cliffs. The scenery is truly mesmerizing.

For a glimpse into Vietnam's history, we can visit Hoa Lu Ancient Capital. This ancient citadel was the capital of Vietnam during the Dinh and Le dynasties. You can explore the temples and learn about the rich cultural heritage of the area.

I suggest we spend a day exploring each of these places, starting with Trang An, followed by Tam Coc, and ending with Hoa Lu. We can also try some local delicacies along the way, such as goat meat and mountain snails.

I am really looking forward to showing you the beauty of Ninh Binh. Let me know your travel dates so that I can make the necessary arrangements. See you soon!

Best regards,
[Your Name]