Here is link of our hotel website that we listed all reputable tour sources:

-1 Day tours ( Ninh Binh , Halong Bay) :  http://hanoiancentralhotel.com/tours/vietnam-adventure  
- Halong Bay 2D1N :  http://hanoiancentralhotel.com/tours/halong-bay-cruises  
- Sapa package:  http://hanoiancentralhotel.com/tours/sapa-tour 

 
Should you have any further questions, please find our contact information via  email: s a l e s @ h a n o i a n  c e n t r a l  h o t e l . c o m or  in this link: http://hanoiancentralhotel.com/