Hello. In my experience on NCL cruises, the Free At Sea / Free At Sea Plus drink packages cover you for the entire time you are a passenger (arrival through departure while on the ship). Some municipalities require that you be charged tax on the value of the drink while in port - if Galveston has this policy, then you’d be charged the tax on the listed price for the drink, but not be charged for the drink itself. Fellow NCL cruisers - if you’ve had a difference experience with your drink package coverage, please correct me. I hope this helps!