I am planning to drive to Seattle and spend a week there. I am thinking of visiting a couple of spots in Oregon during the drive up and down. The general plan is to leave on Friday evening after work and driving to Oregon by night. I plan to explore Oregon for the next 2 days driving slowly up to Seattle and reach Seattle by Sunday evening. I will stay at a friend's place in Seattle for the week and plan to explore the city in the evenings/after 4 pm. We can explore Seattle together too, and I might also take a day or two off from work to go to Rainer/Olympic national park. Finally, I plan to drive back to the bay area sometime around Saturday/Sunday depending on how the plans look like. The drive down can be a one-day (12-13 hours drive) or a 2-day drive depending on how we feel and what we want to explore on the way down. 

I am very flexible with dates and the plan and the above is just a rough plan I am currently thinking of.