I actually just returned from a 10 day trip that included Yellowstone Park and circumventing the Tetons. We just did the loop within Yellowstone and our route around the Tetons was en route to Jackson, WY. Still afforded an excellent view of the mountain range though.

Just be careful when in the parks, the wildlife was plentiful as was the number of visitors. The traffic was very heavy, keep your eyes front and center.