09-06-2023_Yellowstone_1004 by David Young, on FlickrMake sure you watch the body language of the bisons; most of the videos of bisons tossing people are idiots with mobile phones but it pays to watch for any hint of a bison being grumpy and to move on. there's plenty more!
Yes, the tourist coach people tend to go from car park to old faithful then back, but walking a little further gets to several other more photogenic geyers.The worst one there?


Grand Prismatic spring, Yellowstone Park by David Young, on FlickrDo you remember who your guide was? We have just had a look and there are so many!We went last summer. We were going with American family, so the flights were for that reason.
Heathrow to Washington (with a 3 day stop off in Iceland with IcelandAir which added nothing to the cost)
Day to recover.
Washington to Bozeman (change planes in Denver)
Bozeman gets you about 1.5hrs from the west gate at West Yellowstone.
We actually stayed further south in Idaho (beautiful AirBnB) but a bit far from the park.
Recommendations:
You need to more than a week.
Accommodation in the park books up far in advance, book now.
Accommodation outside the park also books up, but you then have to add travelling time. It takes about 20mins to drive into the park from the West gate. It's a huge park.
Go see the classics, Grand Prismatic Spring, Old Faithful, Yellowstone Falls, Lamar Valley (good for wildlife). All of these can be seen easily by car.
If you are up for a hike, you can spend days hiking to some of the more remote places.
Take a private wildlife safari - this was a gift and rather pricey, but great to have a guide take us in at 5am for sunrise and he spotted wildlife miles away that we wouldn't have seen otherwise. But that said, we still didn't see a bear, in fact didn't see one all week.
On that matter, you can hire bear spray, essential if you are hiking.
Classic tour bus routes - these go from the Old Faithful Inn, we did one at sunset which was pretty good.
Lastly, if you have time, drive down to the Grand Tetons.
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Grand Prismatic Spring - quite hard to get an angle to show it at it's best from the ground, but there is a higher view point that is supposed to be better. Use a polariser to cut down reflections and get the colour.
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Lower Falls from Artists Viewpoint.
Gear wise, I'd just take a 24-105 and a 100-400 or longer. Even at 400 some of the wildlife was too far away.
Plus either a good pair of binoculars or a spotting scope.
Take very comfortable footwear.
We missed loads of the park, didn't have time to do much hiking even though we were prepared for it. Driving between places in the park takes quite a while, the distances are big, and there's another amazing view just around the corner, so you keep stopping for more shots.
Enjoy the trip.
Here's the Grand Prismatic from the over look (which is about half a mile walk from the road down well maintained path) from our visit in 2018 - taken on a sunny day with a Fuji XT2
Grand Prismatic spring, Yellowstone Park by David Young, on Flickr
Some good advice from ABTog above about kit to take. I had a Canon R3 with either a 100-400 with 1.4 convertor or 400 f2.8 with a 2x convertor at my feet all week on our last visit in 2023 when we went from June 7th to 21st. During that trip we saw at least 30 different bears including 13 grizzlies - we saw grizzlies eight days in a row (not always different ones) - The most reliable place to see them is the Mary Bay area at the North End of Lake Yellowstone where at least two adult females hang out - they are known as Raspberry and Snow (mother and daughter) - Snow had a cub this year.
The best place to see black bears is near the road between Mammoth > Roosevelt junction > Tower - we called it the Bearmuda Triangle because every time we thought we were going to have a day without bears we saw at least one in that area.
What I found was a great resource on our last visit was looking at the trip reports from Max Waugh https://www.maxwaugh.com/blog/ who was out there running a wildlife photography tour in the week before we went - his reports gave me a general idea of where to look.
The other advice I heartily agree with is that you can't spend enough time there - We intend going back when my missus retires and hopefully we'll stay out there for a month - both times we've been two weeks have flown past.
I'll try to dig out the info.Do you remember who your guide was? We have just had a look and there are so many!