We did 2 nights in tetons combined with 5 in YS
The 2 nights in teton was staying with our old neighbors in their camper in signal mountain campground, right on Jackson lake.
We did the ferry with a hike, but that was about all the time we had. Our kids did some SUP boarding there by the campsite at the boat launch. We ate dinner at Leeks pizzeria which was amazing food and views.
This portion of the trip was a very last minute add on after finding out our friends were going to be there when we were headed to YS, so we left 2 days early to join them. We def. want to go back since it was so quick.
For YS, we stayed in West YS, MT. Pretty quick in and out to the park if you got there by 8ish or so. Our max wait was maybe 15 min to get in.
We picked a quadrant for each day. The grand canyon and NE side one day, the SW side another, and NW another. Then another day just driving around the lake. The grand canyon seriously doesn't even look real. Like, this is an off the cuff, unedited iphone pic;

Very cool park, we went over Jul 4th, and I didn't think crowds were bad at all the individual attractions. We never had an issue with parking, and any walks we did it wasn't anything close to like shoulder to shoulder or anything. Always plenty of space while walking around. Aside from OF, which of course has several hundred people there all day.
Tetons both at sunrise and sunset while camping lakeside did not disappoint.
