Hello all! So me and my boyfriend are planning on taking a 14-20 day road trip from Palm Springs, CA (where were from) to Seattle, WA for next year around June or end of August.
So what were would like is to go from Palm Springs to Santa Barbara and stay there the night (we don't really care too much for sightseeing until were in SB)
Then take the pacific coast high way up to San Francisco
From San Fran to Sacramento and take the 5 freeway the rest of the way up to Portland and Seattle then finally back down the 5 freeway to Palm Springs.

Between SB and San Fran was are things I must see? Or take extra time on?
My boyfriend would rather stay in hotels, and it's okay because we get them really discounted (employee perks ha) usually max with tax $85/night
We really would like to enjoy Portland and Seattle, I have never been outside of SoCal and I would like to see more nature stuff.
Is 14-20 days a decent amount of time? Not too much or too little? This trip is for next year so I can make whichever work.
Around how much are we looking at for total cost? Well be driving his '09 civic Si not a rental.
When should we take breaks? Or which cities do you recommend to spend extra time in?
I have no idea where to start, so any help would be so appreciated!
Is my first trip too ambitious? Should I cut it down to just LA to San Fran?