I will be travelling with my sister and 2 children (ages 16 and 13) to Sequoia National Park. I will be honoring my late husband's request to spread his ashes among the earth's greatest natural wonders. We will be in California from August 6th through the 12th, and my concern is that my teenagers will get "antsy" after a few days (in spite of the beauty around us). Can anyone suggest some itineraries or activities in Northern California if a week turns out to be too long to stay in one place? Is there anything I should avoid, or conversely, absolutely must do? Thanks for your help.