The Great Road Trip

Please help me with some questions

If you have been to the:

Petrified Forest, Grand Canyon, San Diego, San Francisco, Redwood Forest, Seatle or Yellowstone Park

and have any ideas of what we should do, or what we should avoid, or something we need or how long we should stay or something along the way we need to check out please let me know. Seatle is the only stop we are familar with and we don’t want to get stuck somewhere boring for too long or have to leave a good place to early or miss anything cool along the way. Also any tips for driving a ton with a 10 month old and a 6 yr old would be handy.

Very Tentative Plan:
Rent a Minivan and drive from Kansas City to the Grand Canyon
then to San Diego, CA
then to the Redwood National Forest
then to Seattle, WA
then to Yellowstone National Park
then back to Kansas City.

We plan to take 2 full weeks and spread out the driving as much as we can. We plan to camp along the way some and stay with relatives some and probably get some hotels. Google tells me this is about 84hrs of driving and just over 5,000 miles and if we pay $3.50 on average for gas and get 25mpg it will cost about $700. Right now Heath, Peanut, Pumpkin and I are signed up but we would like 1-3 more people to help spread out driving and gas money. Dates, route, stops and about everything can change. Let us know if interested.