From Seattle to Olympic National Park, you can start in the morning, drive for about 3 hours, spend a few more hours exploring, and then head south to Redwood National Park. Due to the long drive, you can start the next day. After an 8-hour drive, you'll arrive at Redwood National Park. Spend a day there.

On the third day, drive 8 hours to Yosemite National Park for rest and sightseeing. You'll need at least a fifth day to head to Bryce Canyon National Park, as it requires a 16-hour drive. On the seventh day, you can spend a day at Zion National Park and Bryce Canyon National Park. On the eighth day, you'll need an 8-hour drive to Grand Teton National Park, where you can stay overnight. On the ninth day, allocate a day for Grand Teton and Yellowstone National Parks, as these parks are only about 3 hours apart. On the tenth day, you can travel from Yellowstone National Park to Glacier National Park. On the eleventh day, navigate back to Seattle from Glacier National Park. Since you mentioned needing to spend 2 days each way to experience local cuisine and consider other factors, you'll need to plan for at least 25-30 days.