You can see most of the wildlife right off the road. Wife and I did a little hiking but if you get up early or out before dusk you can see a lot of wildlife right from the road in the Hayden and Lamar valley areas. I'll try to post up some more pics in a bit.
Most of those pictures were just lightly cropped or not cropped at all, usually done with a 80-200mm or 300mm F4. I really wish i would have had a 500mm i could have gotten some really great shots with longer glass.