We spent a little over 3 weeks in Ho Chi Minh City,  3 weeks in Hanoi (broken up in 1 week and 2 weeks) and 10 days on Cat Ba Island in January-March 2016.

Vietnam Overall:
Vietnamese Food
Eating In in Vietnam 
Beer Review
Motorbiking In Vietnam
Monthly Round Ups  11,  12,  and 13.

Ho Chi Minh:
Video:   3 weeks in Ho Chi Minh
General:   Saigon in Pictures
Accommodation:   On to Saigon: Our 2nd Airbnb,   Airbnb 3: Go Vap District
Food:   My First Bowl of Vietnamese Pho,   Hum Vegetarian Restaurant,   Cheesecake Ngon
Go Vap Street Food,   Bánh Rán Doremon (Pancakes, Smoothies, and Tea in Go Vap) 
Activities:   Popular Downtown Attractions: Notre Dame Cathedral the Post Office, and More,   Tran Hung Dao Temple,   Jade Emperor Pagoda,   The Pink Cathedral,   Le Van Tam Park,   Museum of Vietnamese History,   ICHI Cat Cafe,   Mariamman Hindu Temple, Motorbike To Cu Chi Tunnels

Video:   3 weeks in Hanoi
General: Around Hanoi in Pictures
Food:   Bo de Quan Vegetarian Restaurant,   Sweets and Bakeries in Hanoi,   WannaWaffle,  Loving Huts in Hanoi, Gecko Restaurant
Activities:   Hoa Lo Prison (The Hanoi Hilton),   Temple of Literature,   Hoan Kiem Lake and Ngoc Son Temple,   Ailu Cat Cafe,   Vietnamese Women’s Museum , Thang Long Water Puppet Theater

Cat Ba Island
Video:   10 day on Cat Ba Island
General:  Cat Ba Island
Transportation:   Getting to Cat Ba Island
Food:  Cat Ba Family Bakery,   Buddha Belly (Vegetarian food) 
Activities:   Hospital Cave,   Ngu Lam Peak- Cat Ba National Park, Cannon Fort, Ha Long and Lan Ha Bay Cruise