Dear Friends :
Here are my gears for 14 Hrs. at Grand Canyon and 5 days and 3 nights at Las Vegas. (snip)
You are bringing way too much stuff.
On my first time trip to the Grand Canyon, I brought my 7D, 16-35II, 70-200 II and a 1.4x. I also took a van tour (south rim) that went through Sedona (and lunch) on the way out and through Native American territory on the way back. About 14 hours in all.
Everything was well planned. They hit the high points on the trip. There was some interesting scenery that was passed on by due to scheduling.
The 70-200, while a nice lens, got very little use. I have one or two photos of the Colorado at the bottom of the canyon, which was visible at one of the planned stops. That's about it for that lens. It was neat to look through but not very well suited for capturing the panoramic views.
On the other hand, the 16-35 was on camera 97% of the time, which is ~24mm to ~56mm full frame.
I noticed that the wider end of the 16-35 changed the perspective too much for my tastes- it made stuff appear further away, but it worked quite well for many shots in Sedona.
I took a couple of 5-7 shot single row panoramas with about 50% ovelap on a whim, and regret not doing that a couple more times. The distances are so large that a simple handheld attempt worked for me. The end result more closely matches what I saw vs using something like a 14mm on a FF camera.
I do not own a 24-70, but on a FF camera, that would probably do the trick. I would also bring a 16-35 and maybe a 100mm macro- certainly some sort of macro lens. The handheld pano attempt worked well last time and I do not recall too many opportunities where I would have had the time or the space (physical space at the vantage point or space due to other people) for tripod use. Monopod, sure. The ability to have two camera bodies might be nice.
I didn't know about CPL filters at the time, and wish I had one then.
If you do not live at 7,000' above sea level, it makes a difference, and should be considered if you plan on trucking all that stuff with. Also check the weather forecasts and bring a jacket. Several warm climate natives on my trip bought jackets at the gift shop.
I'll echo previous comments about bringing well into 5 figures of camera gear, much less leaving it in a hotel room.