We are on board Ovation now and yesterday attended a talk about the expedition cruises.
All excursions EXCEPT kayaking and submersibles are included in your cruise fare. Sometimes two in a day.
I was on a 14-day cruise-tour in July with my Sony a6600 and 16-55 2.8 and 100-400. I also had along my Sony RX1007. That combo worked for every aspect of the trip, including whale watching, glacier viewing, and Denali NP.
I've not done Glazer's Rental, but I have done lensrentals dot com, and they come shipped in a Pelican-type hard case, so damage shouldn't be an issue.
I've used this for years for action cams. https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEwjb-sejvfz6AhWtgVoFHddoBEoYABAJGgJ2dQ&ae=2&ohost=www.google.com&cid=CAESauD28w1RFb0lGC4j99Xjlt5Ho8C1unUeEkfA5wbrPD3nJa5lctw0U5p8c4Pz5SCQVOvLFVPoBBj0pMArUqQX6-ZX2ly8pw81TGdYL_nkaFBc27fSWnVbi3yLYMURtM_bpWAb-b4M0keIjks&sig=AOD64_1yXk6bsTVQRFsrHw3VLKmUKotifw&ctype=5&q=&ved=2ahUKEwiU2b6jvfz6AhUPTDABHT8rASwQ9aACKAB6BAgEEBA&adurl=
This is also a good alternative.
https://www.googleadservices.com/pagead/aclk?sa=L&ai=DChcSEwjb-sejvfz6AhWtgVoFHddoBEoYABANGgJ2dQ&ae=2&ohost=www.google.com&cid=CAESauD28w1RFb0lGC4j99Xjlt5Ho8C1unUeEkfA5wbrPD3nJa5lctw0U5p8c4Pz5SCQVOvLFVPoBBj0pMArUqQX6-ZX2ly8pw81TGdYL_nkaFBc27fSWnVbi3yLYMURtM_bpWAb-b4M0keIjks&sig=AOD64_102woJbWJYoAPFN9i8HkfTULn1PA&ctype=5&q=&ved=2ahUKEwiU2b6jvfz6AhUPTDABHT8rASwQ9aACKAB6BAgEEEA&adurl=
Since Canon and Nikon developed a completely separate mirrorless mount, I believe they can't split precious R&D dollars between ML and DSLR mounts. ML seems to be the future.