This summer (mid May to mid Oct) if you are planning a trip to this oldest National Park in USA, gear up to embrace this special place that has so much to offer.
I shall quickly help you build up your itinerary based on my experience to these two national parks.
We booked a place through AirBnb at Island Park,Idaho- closest town to West Entrance of the Yellowstone Park. The drive from Seattle to Island Park, ID was 734 miles and close t0 11 and half hours drive. The ever-changing scenery as we drove Eastwards was breathtaking. We crossed Montana, Idaho and Wyoming to reach Yellowstone and the change of landscape as you move in and out of these states will leave you spellbound. (There are flights also from Seattle to Bozeman to reach Yellowstone but I highly suggest going by road, only to experience the breathtaking landscape). Oh I must say, there is a change of two time zones.
With the research that we did before our travel, we understood that every corner of Yellowstone reveals the park's rich nature and history and it would be unfair if we skip any of the division. We divided the park into 4 different sections and decided to visit one section each day.
DAY 1: Geyser Basins and Yellowstone Lake
Stop 1: Lower Geyser Basin
Stop 2: Mid Geyser Basin- Excelsier geyser and Grand Prismatic Geyser
Stop 3: Hike to Grand prismatic spring overlook
Stop 4: Black Sand basin
Stop 5: Morning glory pool or castle geyser, Old faithful inn and Old faithful geyser (Check the eruption timings at the visitor centre near the old faithful inn)
Spot 6:West thumb geyser basin,West Yellowstone Lake
Stop 7: Lewis lake falls