You're most likely to see dolphins whilst entering or leaving port, rather than in the open sea. These playful, highly intelligent animals will often follow the wake of a ship (the disturbance it causes as it cuts through the water).
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You can see many animals from all species on a cruise ship that you simply can't find as easily on a land-based trip. The ocean alone is a perfect place to see cute animals - take a long look at the sea next time you're on a cruise, and you might be lucky enough to see dolphins, whales, flying fish or seagulls.
Sharks may swim alongside the cruise ship out of curiosity or to see what is inside the ship- bear in mind that sharks may not have the same visual abilities as human beings. Furthermore, sharks follow cruise ships for safety.
For cruise ships, avoiding a whales requires that the captain, pilot, or other bridge personnel detect the whale at a sufficiently large enough distance to change course or speed. This often means detecting the whale several kilometers away.
Although dolphins may seem curious, many of their behaviors are often misinterpreted as “friendly” when they actually are, in fact, signs of disturbance or aggression. If a dolphin approaches you in the water, do not engage, pursue, or otherwise interact with the dolphin, and take immediate steps to move away.
If a dolphin approaches you while you are swimming, do not reach out and try to touch him. These dolphins are wild animals and rarely tolerate physical contact from humans. Trying to touch or grab a dolphin is illegal and is virtually guaranteed to scare them away.
Keep in mind that the ocean is much larger than even the most gargantuan ships, so when the seas are rough, you can still feel movement — just less than if you're sailing on a 100-person yacht.
“Even on warm itineraries in season in the Caribbean and Mediterranean, it can get chilly at night on deck or in the mornings on excursions. Plan to wear layers that you can easily peel off and always include a layer to cope with downpours even if a small folding umbrella or lightweight rain poncho.”