There are a lot of trails in the vicinity of Jenny Lake, within Grand Teton National Park. There is even a ferry service across the lake if you want quick access to the far side. One of the popular destinations on the far side is Inspiration Point. There is a waterfall (aptly named Hidden Falls) on the way up, and the views from Inspiration Point are pretty nice. We ended up hiking to the far side, up to the waterfall and Inspiration Point, and then taking the easy boat ride back.
Part of the trail up to Inspiration Point is literally cut into the side of a short rock face. What is weird is that this caused me zero anxiety (unlike the trails that meandered next to the giant canyons of Yellowstone National Park). Tammy, on the other hand, was the exact opposite. She had no problem the meandering canyon-side trails, but the climb up and down from Inspiration Point was not quite as inspirational to her as it was to me.
The first photo here is of a shadowy Hidden Falls. The second is one of the views from Inspiration Point, looking east across Jenny Lake. The third photo is Tammy negotiating the climb back down from Inspiration Point. And the last photo is of the Grand Tetons, taken from the boat as we rode back across Jenny Lake.