Choosing only 4 is tough, but...
1. Iceland (return)
2. Falklands/ South Georgia/ Antarctica (return)
3. Italy (return), Cinque Terre (desire)
4. Scotland (desire)

Great shots Robertl594! Brought back some fantastic memories. Went there in 2017. 14 days in the Serengeti. 3 days in Tarangire. To the OP, I brought 2 Nikon D750's and a D7000 with 600mm f/4, 80-400, 24-70 and 14-24 (and our own binoculars, even though the guide brought a pair for each of us). I put the 600 on the D7000. The wide angle (and travel tripod) was for camp shots. Cameras used the same batteries. Brought 6 batteries. Our Land Cruiser did have an inverter so we could charge batteries on the fly. Worked pretty well. Dust was really bad in October. Never changed lenses in the field. Vacuumed everything once we got home. We were told by our tour operator that we would have bean bags for each of us to use. They worked beautifully. Ours weighed about 15 lbs each! Ask and make certain that you will (or will not) have them. It was only my wife and I, so we had plenty of seat room and room to move around, if necessary (it really wasn't). We did have our tour company reserve one child seat on each small plane to allow for our photo gear. Never an issue but they did weigh everything (gear, us) before boarding. We'd go back in a minute, and take the same gear again. Have a great trip!!!

Oh yeah! Never heard anything about a limit on the size of your lens. Don't remember seeing any that large either. Tripods and trekking poles are supposedly not allowed, but I did see a couple of each being used. Nobody checked my backpack. Good luck and have fun!!!

We went last October. I did the trek on the Inca Trail. 24 miles and a good amount of rain. Weight was a definite issue, even with the porters. Only brought my D750 and 24-70, 2.8 lens and lens coat (and extra batteries, SD cards, microfibers, etc.). Didn't want for another lens, both on the trail and at MP. I suppose you could bring a longer lens but it's not absolutely necessary. Pretty touristy but you can get some shots without any people in them if that's your desire. My guide on the trek was also my guide in MP. That was great! We heard about the limit on visitors beginning in 2019 and decided to go before it went into full effect.

My wife and I went to the Serengeti in October, 2017. Spent 12 nights on safari in 4 different locations. Had the Land Cruiser to ourselves. We were way over our weight limit for the small plane flights. We had to purchase a child's seat to meet their restrictions. I think that cost us about 350.00 USD. As far as the camera equipment that we brought, My wife had all of her stuff in a Think Tank Airport Takeoff rolling bag. Weighed over 30 lbs. My Airport Takeoff weighed a little more. I also had a camera backpack that weighed approximately 20 lbs. In my bags, I carried two Nikon D750's, D7000, 14-24 2.8, 24-70 2.8, 80-400 4.5 and 600 4. I also had at least 4 extra batteries (same battery for the bodies) and a charger. Our guide had an inverter in the vehicle so we could charge our batteries while driving around. He also provided bean bags for resting our cameras/ lenses on. I brought too many SD cards, but you never know how many photos you'll be taking (especially in burst mode!). I did take at least 5000 shots. I never changed lenses in the vehicle as it was very dusty. I did bring a tripod to use for some night shots of the tents with the stars above. Had to be careful outside the tents at night with animals lurking about. The camps require a guide to get you from your tent to the dining tent after dark. Anyway, I used my 600 and 80-400 for a great majority of the wildlife photos. Sometimes you are very close (20 ft from lions) and other times you are looking past or through other vehicles. One time we were among 20 vehicles all looking at one leopard. That leopard started out being 200 ft away. It ended up walking by just 3 ft in front of our bumper. Have your camera(s) ready. Another day (after already seeing the "Big Five") we were in search of a better rhino sighting. We were by ourselves for over 4 hours. Finally found one! 500 + ft away. Soon, it came as close as 125 ft. Just reached down to make the switch from the 600 setup to the 80-400 setup. Never saw another vehicle. Word gets around fast though (all guides have radios and know one another)! After leaving that area, we started seeing others come in. After showing the others our shots, our guide became an instant hero! and nobody else saw the rhino. If you can carry it, I say bring it. I had everything covered, from 14mm to 900mm (600 on D7000). I also suggest bringing a couple of shower caps for both dust and rain (spray, splash, etc). Depending on the lens, you can cover the end of the lens and possibly the whole camera as well. Just being there is unbelievable! With your photos, you will have many great memories to view, and to print. We can't wait for our next trip to Tanzania. You will have an amazing time on yours! Have fun!!!

I have been reading the conversations on here for a little while and have often found them to be very valuable. Thanks for the education...along with the humor! My photography has been mostly of wildlife and landscapes, especially since I became pretty serious about it in the last few years. We also travel quite a bit so I am trying to improve my "storytelling" skills on those adventures. I use Nikon gear (please don't hold that against me Canon folks! And my wife uses Sony!). My first question here is: what am I better off using with my longer lenses for the largest, clearest images possible, my D750 and a 1.7 teleconverter or my D7000 and it's 1.5 crop factor? Could it be both, depending on what I am shooting and what factors (on that day) come into play? I shoot all RAW, if that might change anything. Thanks for your responses. I apologize if this has already been covered.

I have lots of questions but will not inundate you in one post. Hint: I have Lightroom, but need to take a course in how to use it efficiently. That could be a lengthy topic. There are so many more too! Thanks.