I'd try to swing a day in Yosemite and a day in SEKI if you can. You could hit the valley in Yosemite and then drive to Fresno (Best Western, by the way....wasn't the most fantastic area, but it was okay) for the night. SEKI I think was only about an hour and a half from Fresno, or you could stick with Kings Canyon and see the grove of big trees that is as soon as you get into the park . That would provide an easier in and out of the park for you. Both Yosemite and Sequoia/Kings Canyon were fantastic.
As far as Cambria goes...it depends on what you like and what you want. I see you are from Miami, so you have the ocean and beach all the time. Yosemite and SEKI are very different. Coming to the west coast, if it were me, I'd rather spend my time doing something different than at home and the sights you'll see in Yosemite and SEKI are sooooo much different than the beach.
Also, keep in mind, that the water is MUCH colder in the Pacific and so is the air temperature. You may not even want to go in the water and being on the beach may require a jacket...
We were there the beginning of July and wore jackets the whole time. We normally go to Disney World in August. This year, we did Disneyland over 4th of July- WITH jackets on! Didn't even want to go on water rides. What a difference!
Good luck with whatever you choose!