GTNP is beautiful! We drove in coming from Yellowstone and you're first glimpse of the mountain range is unforgettable. Also preferred how much less crowded this park was in comparison to YNP. We didn't have too much time to spend here, but we made it to hiking around Phelps Lake. There is also a 40 ft high rock you can jump off of into the lake...if you're feeling brave! I wasn't but my friend was. Loved it here.