If you had opportunity to work remotely in Vietnam for 4-6 weeks, what would your itinerary look like?

I’ve found out my company allow us to work abroad for 1 month per year.

I’d like to visit Vietnam, and am considering spending 4 weeks working, and 10-14 days vacation.

However, not having been before. I’m struggling to come up with a plan, where is worthwhile visiting, and where would be a good place(s) to set up a base to work from my laptop.

Does anyone have any suggestions? Is there anywhere worth spending a long time in, or would I be best to travel on the weekends to somewhere new?