Unfortunately, your in-port experience is constrained by a cruise ship’s arrival & departure ‘port call’ * schedule for each port. (e.g.: busy ports, like Nassau, with MAX “port call’ of 8 hrs & some even less’
                                              * “Port call” means the time a ship is docked in port.

    a. Port Authorities and Regulations: own schedule regs based on adequate space, cruise line's
        itinerary, port capacity, berths availability & local regs on vessel size, eco-impact, & safety.

    b. Cruise Line Itineraries: planned years ahead including negotiated dock times, in-port stay
        balance between shore time & ship's schedule.

    c. Econ Considerations: Both ports & cruise lines have economic interests:
        Historically:
            Ports: promote max # of ships & guests to MAXIMIZE local income
            Ships: optimize operating costs & maximizing guest satisfaction.
       Trend is reversing: as many ports seek to restore their citizen's quality of life by limiting # of cruise ships & guests at one time because such huge numbers destroys the very attraction these ports & sites offerred. 

    d. Eco-Restrictions: Some ports (Amsterdam & Venice) restrict dock times & even some ships. (see above)

    e. Tide, Weather & Boat Draft: can influence docking safety & access,

    f. Security & Safety Protocols: can influence port-of-call times: security checks, customs process, & compliance.

   g. Passenger & Crew Logistics: time required for: passenger’s disembark/reboard, crew changes, supply & maintenance

   h. International Agreements & Laws: safety and environmental standards (International
         Maritime Organization (IMO)