I'm familiar with Northwest Wyoming mostly. Here's a few thoughts FWIW: 1) Yellowstone and Grand Teton National parks are treasures and some of the most beatiful parts of our country; 2) these two parks have gone to an advance reservation system for camping -- try to make reservations far in advance if you wish to camp in the parks proper; 3) There is plenty of dispersed/established camping the the national forests -- keep in mind the closer to Jackson Hole you are, the more congested camping will be; 4) check out the Gros Ventre (pronounced Grow Vhant) River campground north of Jackson -- very nice and convenient to town, Gran Teton, and Yellowstone (day trip); 5) The Wind River range (basecamp Lander, or Dubois, WY) is spectacular; 6) keep in mind most of the overland trails cut across WY, e.g. Mormon, California, Oregon trails. Much of the trial are intact, visible, and accessible on BLM land.; 7) I esepcially recommend driving the Lander Road from South Pass City, WY to Boulder WY. You can camp free and easily along this road as well. The Lander Road was the first federally-financed highway in the US. Lots of other hints/suggesstions if the northwest part of WY remians in your plans.