If I have a day or two to visit Yellowstone..,.

1. Check for a site at Grizzly RV Park.
2. Yellowstone is simply a figure eight. Northern circle has the most wildlife. Southern circle has the most geysers.
3. Plan on going the northern circle at dawn and/or sunset for best opportunity to see wildlife.
4. If I were planning what you are, I'd leave early, do half the northern circle, hit the southern one during the afternoon and then the rest of the northern circle at dusk. It'll be busy and time consuming, but doable....Dennis