Secret901, thanks for the explanation regarding the use of "ban" for
"you". Is the use of the name "iguazu" intended in the same way?
Please translate the following:

Than goi iguazu,
Cam on ban da chuc mai manh khoe, trong 2 cau iguazu hoi tham  thi cau
(ban khoe khong?) dung hon, vi tu ngu VN rat phong phu nen cau  (ban
manh gioi khong ) neu nghi ra co nhieu y nghia khac nua cung duoc nen
co the giai thich iguazu khong hieu kip, khi nao iguazu qua VN Mai se
huong dan iguazu hoc va gai thich cho iguazu hieu nhe. Con bay gio
cung chi con may ngay nua la tet  Mai chuc iguazu buoc sang nam moi
that manh khoe va moi dieu may man trong cuoc song luon den voi iguazu
nhu y nhe. iguazu a, sao iguazu lai ban nha roi di o  day do voi be
ban lam gi vay? du di dau thi cu di, con nha cua thi cu de do  mot
ngay nao iguazu gia  yeu tro ve  song tai do co an nhan hon khong? du
la nha que cung la que cua Ba me iguazu ma. iguazu oi. vi Mai nghi
iguazu da xem Mai la ban nen Mai co vai y voi iguazu nhu vay, neu
iguazu khong  vui thi cung dung gian Mai nhe,dung la moi nguoi co mot
suy nghi rieng co ai giong ai dau. Mai vai dong tham iguazu nhe, gan
tet Mai ban qua nen chua ken hinh Mai cho iguazu duoc,  di choi tet
chup hinh roi Mai se goi cho iguazu sau nhe.
than chao. hen iguazu thu sau.

Hi again iguazu-ga,
You're right.  Referring to the audience by name is a way to show
friendliness.  In the letter there are some references to T?t.  If you
don't already know what it is, it is the largest Vietnamese holiday. 
This year, it will occur on January 29.  You can find some information
about it here: http://en.wikipedia.org/wiki/Tet

================================Translation begins==========================
Dear iguazu,
Thank you for wishing me health.  In the two phrases that you used to
ask about my health, the phrase "B?n kho? không?" [Are you healthy?]
is more correct, because Vietnamese vocabulary is rich, the phrase
"B?n m?nh gi?i không?" [Are you strong and well?] has many other
meanings but maybe you won't be able to understand my explanations. 
When you visit Vietnam I will guide you and explain it to you, OK? 
It's only a few days until T?t; I wish you a healthy new year and
auspicious things will come to you.  Iguazu, why did you sell your
house and live your friends?  No matter where you go, you should leave
the house alone so that one day when you're old and weak you can
return to live a comfortable life there.  Even if it's in a rural
area, it's still your parents' house.  It's because I think that you
already consider me a friend that I have these thoughts.  If you're
unhappy please don't get mad at me.  Everyone have their own opinions,
nobody is alike.  I wrote this to know how you're doing.  It's almost
T?t so I can't send you my pictures yet.  Let me travel during T?t and
take pictures and then I can send them to you.
Sincerely.  See you at the next letter. 
==================================Translation ends=========================

Thanks for the quick reply and additional explanations.