On board these floating cities, travelers will be able to enjoy theme parks, shopping malls, spas, water parks and fitness centers, among other services. These ships are designed so that passengers do not need to leave the ship to have a complete vacation experience.

Technology will play a crucial role in the construction and operation of these ships. One of the main focuses will be environmental sustainability. Mega cruise ships will be equipped with more efficient propulsion systems, including the use of alternative fuels such as liquefied natural gas (LNG) and, in the future, hybrid or electric propulsion technologies.

In addition, advanced onboard waste management and recycling systems will be implemented, reducing the environmental impact of operations. Ships will also integrate renewable energies, such as solar panels and wind turbines, to minimize dependence on fossil fuels.

Digitalization will also be key to improving the passenger experience. From personalizing services through mobile apps to using artificial intelligence to anticipate guests' needs, technology will enable a more seamless and tailored experience.

The growth in cruise capacity poses significant challenges for tourism destinations. Port cities around the world will need to prepare to handle large numbers of visitors simultaneously. This can place strains on local infrastructure, natural resources and communities, especially in smaller or resource-constrained destinations.

To address these challenges, some locations have already begun to implement regulations that limit the number of passengers per day and promote responsible tourism practices. This includes measures to protect fragile ecosystems and ensure that the economic impact of tourism benefits local communities.

The range of activities and services offered onboard cruise ships will continue to diversify. In order to appeal to a wider range of travelers, cruise lines are developing themed experiences and specific programs. Examples include wellness retreats with yoga and meditation, gastronomic tours with renowned chefs, and cultural activities related to the destinations visited.

This diversification will allow cruisers to cater to the preferences of different market segments, from families and couples to solo travelers and seniors.

Despite the exciting prospects, the expansion into mega-ships and floating cities also faces significant challenges. Environmental sustainability will be a central issue, and cruise lines will need to work on innovative solutions to minimize their ecological footprint. In addition, waste management, energy consumption and interaction with local communities will require a balanced and responsible approach.

Another critical area will be cybersecurity, as the digitization of shipboard operations and reliance on connected technologies will increase vulnerability to cyber attacks. Operators will need to invest in robust security systems to protect both passengers and operations.

The development of mega-cruises and floating cities promises to redefine the way people experience maritime tourism. The combination of advanced technology, sustainability and personalized experiences will not only attract new travelers, but also set a new standard for the industry.

Ultimately, the cruise industry is on the threshold of a revolution that will not only transform the way people travel, but also how these vessels interact with destinations and the environment. This holistic approach ensures that, by 2035, cruises will be both a means of transportation and a destination in their own right.