Vietnam very cheap tour highlights:

Day 1: Hanoi arrival
Day 2:  Hanoi
Day 3:   Hanoi – Halong Bay – overnight on boat ( small group tour)
Day 4: Halong – Hanoi - Sapa
Day 5:  Sapa village
Day 6:  Sapa – Lao Cai – Hanoi
Day 7: Hanoi – Night train to Hue
Day 8: Hue city tour
Day 9: Hue  Danang - Hoi An ( Open bus )
Day 10: Hoi An
Day 11:  Hoi An – HCMC
Day 12: HCMC
Day 13: HCMC – Mekong Delta
Day 14: HCMC
Day 15: HCMC -  Cu Chi tunnels
Day 16: Depart