The cruise industry is on a mission to achieve net-zero emissions by 2050, prompting a shift towards exploring sustainable and alternative fuels. While liquefied natural gas (LNG) offers some emission benefits over diesel, its limited reduction in CO2 production and methane emissions pose long-term sustainability concerns. Green methanol, produced without fossil fuels, shows promise in reaching net-zero by extracting carbon from the atmosphere. However, challenges like lower flash points and bulkier storage need to be addressed. Hydrogen fuel cells, providing clean power through chemical reactions, offer a path to zero-carbon fuel production. Despite its advantages, hydrogen faces obstacles such as difficult transportation, storage, and explosiveness. Batteries present a viable short-term solution for emission-free operations in sensitive regions, but their energy density is insufficient for powering large cruise ships on standard itineraries. The industry's emphasis on adaptable propulsion systems and investment in multiple power sources demonstrate a commitment to a sustainable future. While no single fuel emerges as a clear winner, ongoing research and innovation seek to pave the way for a cleaner course in the cruise industry.