Dear XXX,
How are you? It has been a long time since we last wrote to each other.
I am planning to go on a vacation soon. Are you staying at San Diego right now? I heard that it is a beautiful place. There are many sight-seeing spots around that area and the sceneries are breathtaking. I would really love to come over during my holiday. Can you please help to arrange a tour for me so that it would be more convenient when I get there? Thank you so much!
Yours sincerely,
XXX