How do you write a letter to your friend telling him that you will like to spend your coming holiday with him?

better off phoning if possible because you can read their emotions better and you can answer any questions they may have and have solutions for any problems they may bring up. Much easier over the phone than in a letter.

In a letter the person may flat out reject the idea without telling you why. On the phone they may reject the idea but you could on the spot tell them things to overcome their objections.