Depart:
7:20 AMSingapore 14:40 PMHanoi $172.54
Return:
14:10 PMHanoi 0:35 AM (+1) Singapore $160.85
Private Rooms: S$26-46 172.54+160.85=333.39
Asia Paradise Hotel
34B Hang Tre Hoan Kiem (map) - 0.36 km - Hotel
$20/day for meals
333.39 + 182(hotel-7days) + 140(meals-7days) = 655.39
Hotel cars
H anoi however is quite a bit further, and can take anywhere from 30 minutes to one hour depending where you are staying. The cost here is considerably more between $ 24 - $60.
Alternative
Bicycles can be rented out for around $ 2 per day, they are a bit wobbly, but good fun and a great way of travelling around.
Motorbikes are between $5-9 a day, although I will let you decide whether insurance is included.
Shopping: 1344.61