I also really like Driggs. Spent a few nights there when doing the Tetons. High was like 77 in July. Decent Tex Mex (or maybe just because we were hungry from hiking - I swear there was dusting of parmesan on my beans, but it was good enough and they had a bouncy house for the kids). I always laugh at the amount of potatoes they shove into TexMex up in the UT/ID/MT/WY area. The grocery store is pretty great for being in the middle of nowhere. I don't fish, but I imagine it would be great fly fishing. Drove into Driggs for the first time coming from Yellowstone. It was dark, one of those late afternoon summer storms. Kids and wife were asleep. Isbell's Traveling Alone came on as I neared the top of the pass. Bliss.
Yellowstone is my favorite place on earth. I can't imagine blitzing it in a single day. Better than never seeing it, I guess. I remember pulling off a road just past a little bridge, I forget why. Maybe so the kids could stand on a pile of snow or something. There is snow in the passes through July. Anyway, under the bridge was a steaming fumerole. Not even marked on the map or had a sign. But a steaming, gurgling portal to hell itself was there, belching sulfur and a rivulet of hot water made pink and red and orange mats of thermophile algae. Like there so many crazy geological features that what we would have built an entire state park in Texas around is basically forgotten. Hot springs are amazing. Geyers are fucking double amazing. Mud pots, fumeroles (dragon's mouth - holy shit) are amazing. Flowstone deposits are cool as hell. You'll be walking along some boardwalk and a geyser will erupt and holy jesus fuck! Maybe it erupts every couple hours, but if you walk by hundreds there's a good chance you'll see one go that only does it every week or so. And you saw that, something that might just be a little placid spring for hundreds of other folks. The evolution of the springs and fields is also amazing (article link below). You may come back a few yeas later and an entire new area is becoming thermally active, and yet an old area is losing its fizz.
And just when you get mildly used to those, you realize you are in the middle of this gorgeous boreal wilderness. The river and gorge and waterfall is tremendous. Taking a picnic along the Snake and swimming in a hot spring. Washing your hiking sweat off in the Boiling River swimming area. Elk and buffalo and bears. So many bears. And wolves. Hell, even Thermopolis is pretty rad, IMO. The lake is so pretty, and you gotta love the thermal features under the water. Seeing where the old wildfires were, and where the new growth is. Repeating the same dad lecture to the kids on how interesting the Continental Divide is every time you cross it (you cross it so many times). Hydrological basins are interesting as hell. It's super weird that the HEB on Spicewood drains to the Brazos, but one block over the storm drain goes to the Colorado. Its like that, only a different fucking ocean. One day I'm gonna hike to Two Ocean Pass, eat an edible, and figure it all out man. "Hey kids, were not in the Pacific hyrdological basin. That's a different ocean from back home. Oh wait, back over the divide. Now a cup of water poured here will flow all the way to the Gulf of Mexico!" They hate that, except that they secretly love that.
If you are there for 5-6 days you can take some hikes to geyser fields and despite the crush of buses and whatnot, you might be the only people there for a couple of hours.
I even (especially) love the signs with the parboiled child fucking dieing.
Here's a crazy article that makes me want to get in the truck, drive 24 hours, get a backpacking permit and fucking go:
https://www.usgs.gov/center-news/yellowstones-newest-thermal-area-close-and-personal-visit?qt-news_science_products=4#qt-news_science_products
And shit, I forgot Quake Lake! That shit is lit!