Photographers, what camera gear do you cruise with?

Nikon A900 and my Smart Phone. Good enough for me.

Two compact cameras and iPhone.
Sony Cybershot RX100vII. Compact point and shoot. My all purpose camera.

Olympus TG5. Waterproof compact point and shoot. For beach and rainy weather. Snorkeling.
Both are small enough that I can carry in my shirt or pant pocket, or daypack.

Just fine for bringing back memory photos and short video clips.
Does not get in the way of enjoying my cruise, and not too heavy or too much camera gear to fuss with on shore excursions.

I travel lite - carry a GoPro in my pocket.

It all depends on the situation. I have a Nikon D750 with several lenses and a battery pack, a Fuji X-T2 and a Fuji X-T20, with multiple primary and zoom lenses, and of course my cellphone camera. If just on a standard Caribbean cruise might just bring one Fuji with one lens pretty light or maybe just cell phone if only going to be on board and at a beach. If touring cities ie Baltic Mediterranean etc. will bring both Fuji's one with a wide angle lens and one with a longer lens(zoom lenses). Really pretty light to carry around. When there is landscape or wildlife photography will bring the Nikon and several lenses, and may also take one of the Fuji cameras. i don't find this prohibitive in the weight category, and I'm not worried about banging scratching getting slightly wet or other abuse, cameras stand up to it. Whats the point of having photo gear if your too afraid to use it. I also do not have a formal camera bag or case, I pack them in a backpack for air plane and other transport, and just carry with backpack and strap when out for the day. Always bring lots of extra batteries.

I have a D5300 and a Sony NEX 5T mirrorless. I opted to take the NEX and don't regret it. It's a hassle to travel with all the camera equipment/lenses of a larger DSLR. Still got a lot of amazing shots since the imaging sensor is still APS-C sized.

These last 2 cruises we took I brought my Canon I5 with 15-50 and 80 -200 lenses equipped with polarizers. Almost as important to me was my monopod which also doubled as a walking stick while on shore excursions, because I found that if I took a long zoom shot or slow timed shot the pictures were still in focus if I decided to enlarge them.

I have a Canon 7D with various lenses that I used to cart around on trips. However, I gave that up for a simple Fuji FinePix HS50EXR which is a bridge camera. Easy to carry around great lens range. Great camera for family travel.

I bring a waterproof camera for cool shots from the beach and pool and then my big camera for formal nights. Other than an extra set of batteries and a charging cable, that's all I need.

Canon T3 with 70-200 for long shots from the ship

GoPro Hero5 Black, with dive housing for anything else.

GoPro takes 4k video, and 12mp photos

Nikon D7000