Here's a couple old posts, maybe something will help in your plans:
Yellowstone and the
Wyoming Area ...... and ......
Ditto For the Tetons: We stayed at Colter Bay Campground, the one without hook-ups in mid-June 2010, it was a nice place for such a large campground and close to showers. Our daughter & her hubby needed them, not having showers in their A-Liner. I have heard good things about Gros Ventre Campground...get more animals walking by or close by, etc. Nice views.
If there again, I believe I'd try Gros Ventre.
The Colter Bay Visitor Center and Indian ArtsMuseum by the Colter Bay Campground is really a neat one.
Likewise, If you make it to Cody, try to see the Buffalo Bill Historical Center with Five Museums Under One Roof.
http://www.bbhc.org/These 4 were really great:
Buffalo Bill Museum
Whitney Gallery of Western Art
Plains Indian Museum
Cody Firearms Museum
The Cody Chamber of Commerce has a nice Visitor Center (full of information) & with a really nice art gallery.
http://codychamber.org/visitorcenter.html More Yellowstone/Tetons & a Little Glacier with some Canada.