We based out of Grant and day tripped to Jackson, GT is right there next to YS. In fact, get a combo pass for the two parks so you don't have to drop the cash twice. The line at the Ranger station to get in can seem long but it moves pretty quick. Be careful and leave yourself plenty of stopping room. Folks that haven't seen moose or buffalo up close will nail the brakes and stop right in front of you. If that is you, just drive up the road a little and you can find a pull off, not like the elk are leaving the country, but keep a lot of distance between you and wildlife!!!! You can drive around YS in less than a day and I would suggest doing it counter clockwise, everyone headed for Old Faithful first thing and the clockwise route was packed early in the day but the falls parking was fairly empty. Coolers and bear boxes! Though four year olds can ride their scooters all over the park (meals on wheels) past moon rise, if you leave a cooler out to dry there will be a yellow slip on your camper before you can say Yippee Ki Yay. Use the bear boxes on your site for the sake of the bears and you. We only saw the butt end of one up near the northern lodge but they're around obviously. Gas station is right there at the Grant Village. Tow speed; 65mph or less! Across the state. While you're towing. Otherwise a very polite trooper will introduce themself to you and play a quick round of trivia pursuit with ya.
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