Joel, have you ever been to Yellowstone? Advice is best given if we know number of days in park and what you really want to shoot.

The park highway is laid out in two loops like a giant figure 8.
Do upper loop one day and lower on second for drives.
You could spend days watching water boil if you want to do Geyser basins, and if you have never been that is the thing to do. It is what makes Yellowstone, Yellowstone.
For wolves and wildlife Lamar Valley, elk and buffalo on the Madison, Big Horn in valley by North West entrance.

Road hunting abounds, bring the big lens and keep it out of the case.
Landscape ops are everywhere, to ask where to go in Yellowstone is to find where others found inspiration. Honestly it can be all over the park.

Give some info, days in park? Priorities, wolves, waterfalls, geysers, landscape or a mixed bag?