I went in Nov of 2014. I brought too much gear but yes, I'm glad that I brought two camera bodies since I did drop one on the deck of the yacht because the seas were rough that day as we were returning from the beach. The camera body got detached from the lens, which had the strap attached to the lens foot, and fell on the deck then as the boat (yacht) leaned it started to slide toward the edge toward the sea. I had to kick it to keep if from going in the drink. Luckily it still worked, but needed $600 repairs when I got back to the states. If I had it to do again I'd only bring my 100-400, 16-35, 24-70, 1.4x, and two bodies (1 APS-c, 1 FF). I'd also bring a better laptop. At the time I had a very slow netbook computer and it worked, but it took 2-3 hours to download images from each days shoot.
I also brought a GoPro camera for underwater snorkeling. I am very happy that I did. The snorkeling was probably about 60% of the fun of going since the sea life is very beautiful and capturing it was part of the journey. I also brought a wetsuit, fins, snorkel, and mask. I made the mistake of not reserving a weight belt for buoyancy control so it was difficult to go down and stay down.
I was on a small yacht too and I'm glad that I brought a lot of different sea sick meds and remedies. I used them all on the second day because the sea got a little rough. I brought the patches, pills, and bands for the wrists. Those bands for the wrists really work. I was on a 125' yacht called the Tip Top IV belonging to Galapagos Travel. We only had 12 tourists and 2 leaders in our group. Our tour was specially for photography as one of the guides was born in the Galapagos and she was also a Naturalist. So we actually had 2 naturalists. They took us to an island twice a day and took us snorkeling twice a day.
Have fun and post some pics when you get back.
PS - I have a bad back and one bad knee and I did fine. Some of the paths were strewn with lots of rocks, but I was fine; just had to take my time and pick a path that was best for me.
Here's some links to videos I took with my GoPro while snorkeling:
https://youtu.be/5Me8dx_yiFEhttps://youtu.be/aqN4vo0dDd0https://youtu.be/4iQgQm-NVFchttps://youtu.be/CkBson0Qtu8I went in Nov of 2014. I brought too much gear bu... (