Goldilocks,
If an expats doesnt learn the runnings or "how deep the runnings" are as you say, then they will not be living here long. Both Bnewb and I have seen this happen more times than we can count. But all successful expats do figure that out - that comes with living here day to day for years - there is no way to avoid learning it. Those that fail may not have learned the runnings or had been doomed by taking bad advice from those who thought they knew the runnings.
But it is sound advice to let the hotel staff know where you are going and when you should be expected back, there is no harm in doing so. And in my decades of experience here, there has been several occasions where helpful staff have assisted when things went amiss. As the credit card commercial says, priceless.