I spent 2 and a half days in Grand Teton National Park in July of 2020, as part of a larger trip in Wyoming which included Yellowstone National Park, and Craters of the Moon (Idaho)
Some of the highlights of Grand Teton were: Mormon Row, Schwabacher’s Landing, Snake River Overlook, Oxbow Bend, Jenny Lake, and my absolute favorite, Cascade Canyon. The Cascade Canyon Trail is a little over 9 miles out and back, and follows a river inside a canyon nestled in the Tetons. If you only have 1 day inside Grand Teton, the Cascade Canyon hike would be my absolute recommendation.
