I'm planning to visit Vietnam (Hanoi and HCMC) next month, solo trip, for my birthday. I'm reading a lot about Ha Long, Sapa and Ninh Binh and various excursions. My questions is how much time, 3,4 or 5 full days and what are considered must sees in Hanoi. Ninh Binh sounds a lot like Ha Long (being on the water) but less tourists. Sapa sounds like a long trip from Hanoi and I'm curious is it really worth the amount of time and effort to get there. Kinda the same for Ha Long. I like being in the city and being immersed in the culture when I travel and curious if a day trip to Ha Long and/or Ninh Binh will be enough or a full overnight two days. I guess I'm getting confused with all the info I'm reading. Any feedback would really be appreciated.