Our suggested itinerary is:
Days 1 to 3 – Hanoi / Days 4 to 6 – Sapa / Days 7 to 9 – Ha Long Bay & Bai Tu Long Bay / Days 10 to 12 – Ninh Binh & Tam Coc / Days 13 & 14 – Hue / Day 15 – The Hai Van Pass / Days 16 & 17 – Hoi An / Day 18 – Da Nang / Days 19 to 21 – Ho Chi Minh