The day you spend driving to and back from Glacier can be better spent in Grand Teton, in my opinion. As far as hiking easily in Grand Teton, the hike to Hidden Falls and Inspiration Point at Jenny Lake is a very easy hike as well. Also, the hike to Phelps Lake, in the Laurance Rockefeller Reserve, the newest part of Grand Teton, is really pretty easy and is very beautiful, especially when you get to Phelps Lake where the compound was that has now been totally reclaimed. Look out over the lake and see Death Canyon as well.