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I went there for the first time a few years back. I went in the end of July. I camped outside of Yellowstone in this place called Beaver Creek. Even though it was outside of Yellowstone it was impossible to get a week-long site. So I ended up splitting it between two sites in the same campground. It's also a good idea to try to get there during the week instead of the weekend, for obvious reasons.
If you're going to do any hiking in Yellowstone, make sure to start no later than 8:00 if you want to avoid the crowds. Start with the hike that you really want to do, and then fill the rest of the day with other less important hikes that you can tolerate dealing with a crowd. You absolutely will be in a huge crowd if you're going to all the major tourist destinations, which you absolutely should because they're all fucking great. Aside from Mammoth Hot springs I guess.
There's also big hikes outside of Yellowstone. That was like the last one I did and there was probably five people on the entire 7 hour long hike. And if you feel like driving you can head 2 and 1/2 to 3 hours south to the Tetons. It's a really spectacular mountain range. You're going to be doing a lot of driving dude. But it's really really cool. After a week at camping and hiking there I was too tired to keep hiking, but I was absolutely not done being there. So much to see.
>Pic related is this waterfall I found off a trail in Yellowstone. I connected with this water fall in a way I never have before.