Tent Monument National Park - hike the Slot Canyon in very early morning
Ghost Ranch where Georgia O'Keefe spent some summers
Petroglyphs numerous sights
Los Alamos - bit of drive but worth a look
Enjoy...
I am a fellow Chem Eng. I have been using the R5 and RF800 lens with a monopod for the last month. My subjects are mainly birds. The AF with eye detection is providing a great number of keepers. The continuous high speed shutter is really nice when birds begin to fly. The f11 is not an issue when used in good light. You can position yourself to get good catch light in the eyes. The in body 1.6 crop is also handy for still subjects a long way away as it helps with auto focus. I am so impressed with the RF800 that I have not put any of my L glass on the R5 yet.
My new MacBook Pro works fine with Bridge on the old operating system. Once upgraded to Catalina, the spacebar command in Bridge no longer brought up full screen images. Some inherent conflict. Removed Catalina and restored old system and all works now.
Best wishes for a great trip. Your 100-400 can be great on both 7D and 5D. Low light generally not a problem. 16-35 on both too. 24-105 too. No extenders needed. Extra batteries a must. To mirror other posts the animals will be much closer than you imagine.
Ruggard Parka cold and rain protection works well to keep camera and battery warmer. Your hand go in the sides like a muff. Your hands provide warmth and thick insulate keeps the warm in and cod out. Worked well for me in Antarctica.
Take a second camera body like 7d mark 2. Perfect with 100 - 400. You will find your 16 - 35 on your full frame very useful for the beautiful landscapes.
B & H may actually provide a selection of lens to try.
I found a dry bag, polarizing filter and waterproof pocket camera TG5 very useful.
You will really enjoy the scenery!
You may wish to try extensions tubes with your 135 mm lens. This will make it a nice macro lens for flowers. Then you may another lens for landscapes...perhaps a 50 prime 1.4....This lens will also work very well with extension tubes for macro. This would be an inexpensive way to start out and still provide excellent results.
Avoid rapid changes in temperature when you come in from going ashore....I just left my camera in an overboard dry bag until everything came to about room temperature. I also found the Ruggard Parka cold and rain protector very helpful when out in the cold weather while on land excursion and while taking photos from the bow of the ship.