Thank you for one of the most memorable days of my trip.

为了旅途中最值得纪念的一天，谨向您表示感谢。

Thank you for one of the most enjoyable visits we have had in many months/ for some time.

在您处的参观访问，是我们几个月（一段时间）中最愉快的一天。谨向您表示感谢。

Thank you for doing so much to make my trip to New York interesting/ pleasant / fruitful.

为了使我去纽约的旅游有趣（愉快）（大有收获），您做了许多事，特此致谢。

Thank you so much for your generous hospitality.

非常感谢您慷慨的款待。

I hope something will bring you to New York soon， so that I can return/ reciprocate your kindness/ hospitality.

希望不久您能有机会到纽约来，使我能答谢您的盛情款待。

You must give me an opportunity to return your kindness when you visit my home.

希望您光临我处，使我能答谢您的盛情。

Thank you very much indeed / ever so much/ so much.

最真诚地（确实）（非常）感谢您。

Many thanks for your kind/ warm letter.

感谢您友好（热情）的来信。

Thanks a million / ever so much.

万分（非常）感谢。

Please accept my sincere / profound appreciation / gratitude for ……

请接受我真挚的（衷心的）（深切的）感谢……

I sincerely / deeply appreciate……

我真挚地（深深地）感谢……

There is nothing more important / gratifying to me than receiving one of your letters.

再也没有比收到您的来信更使我觉得重要（感激）了。

Your letters are so much fun/ entertaining.

您的来信充满了乐趣（带来了欢乐）。

Your most courteous/ considerate/ delightful letter……

您那彬彬有礼（体贴入微）（令人欣慰）的来信……

I cannot tell you how much your letter relieved/ delighted/ amused me.

我无法告诉您，您的来信使我多么高兴（宽慰）（陶醉）。

I love the way you describe/ say/ put things in your letters. You make even the smallest incident seem so interesting/ important/ amusing/ charming.

我很欣赏您在信中描述各种事物的手法。您的妙笔使微小的事情都显得很有趣（重要）（动人）（神秘）。

It was （ very ） good/ （ very ） kind/ （ very ） thoughtful of you……

承蒙好意（美意）（盛情）（关心）……

At the outset， I want to thank you for your kindness to me……

首先，我要感谢您对我的友爱和问候……

Believe me， I am truly grateful for……

我确实真诚地感谢你……

We were deeply touched by……

……使我们深受感动。

I regret very much that I did not have an opportunity to thank you personally.

未能面谢，深表遗憾。