We did a similar trip in 2016 although LAX - SFO Over two weeks. It was with our then 3 month old (travelled from U.K.) and we made a few mistakes - although still had an awesome trip.

I totally agree with your thoughts on only having two or three locations. We found we moved around too much and was stressful for everyone.

Secondly, and this may not be relevant to yourself. But, our little one was already in her own room and we found sharing a standard hotel room with her was difficult for her as she wasn’t used to the noise of us being around her which resulted in us often going to bed not long after her.

Finally, and again, in may or may not apply to you, but we found our time out of the cities more enjoyable than in them. Fortunately, we had both visited LA and SF so didn’t stay there other than 1 night either end. Our little one loves the outdoors and our time at Yosemite and in and around Monterey were the best and most enjoyable parts.

You will make mistakes - assuming it’s your first - but you’ll have a great time!!!

enjoy.