Ooh oooohhhhh - my favourite Asian city!
You can basically walk around Hanoi - wander around the French Quarter, Old Quarter and the lake. The Temple of Literature and the Presidents Palace are a not to miss. Warning - for locals these places are free but for tourists, a fee is charges.
Hanoi is quite cheap - so you can get a decent hotel for a very reasonable price. Look here
http://travel.roughguides.com/roughguides.html
We also had a day trip to Ha Long Bay - 3 hour bus ride there, 4 hours on a boat around the mountains and caves and 3 hours back. You can do this by a 2 day trip. The tour operators were based around the lake.
Have a great time
