Best route into Yellowstone from the east

We visit Grand Teton at least three times each summer, usually June, July and August, for a week at a time. Park at Colter Bay Campground and fish on Jackson Lake most of the time. Nothing more majestic than the Tetons from the lake. If you have time, stop at Colter Bay and take the boat tour around the lake. The cruise starts out from Colter Bay, down south around Elk Island, up to Moran Bay ( at the base of Mount Moran) then north for a ways to Waterfall Canyon and then back to Colter Bay. We love being on that lake and having lunch on the boat in Moran Bay looking up about 6,000 feet towards the top of Mount Moran. About two summers ago we saw six different Grizzly Bears, including two sub-adults right alongside the bike path from Moose Junction to Jenny Lake. Got about a 30-second video of them from about 40 feet away. Then, last summer coming out of the Jenny Lake circle we saw a little brown bear close to the road and I was able to get some shots before he ran away. Grand Teton is a different experience than Yellowstone as I think Yellowstone has more features and Grand Teton is more majestic.