Google for - "hotel wifi solutions"
There are multiple prebuilt appliances.
Some things, you contract out. HVAC, plumbing probably, repaving the driveway. Unless you're already a computer/networking wiz, I consider this to be at that same level.
Do you want to wing it and build your own (and maybe get it wrong), or do you want to run the hotel?
And there are multiple levels of getting it wrong. Exposing customer data, exposing your hotel network, consumption overages, etc.