Yosemite Lodge at the Falls, was good, right in the centre, they have buses that go round the park on a loop, but it was close enough to have a stroll into the Village Centre, that had the deli (they make up great sandwiches and salads) post office, shop etc.
Depends which month you are going. We went in the height of summer, so paid extra to be in the park so that we weren't in the mega queue trying to get in each morning. We got up early and went for great walks before it got busy. Really good breakfast, you get a voucher for x amount, and then you basically fill everyone's tray with breakfast, fruit, muffins etc, things to keep you going whilst on the walk. There was a pool but we didn't use it.
San Francisco, we loved the Argonaut Hotel, just on the edge of the bustle of Fisherman's Wharf, next to the cable car stop, great restaurant attached, and also the bike hire place was next door. Fab views of Golden Gate Bridge, but I didn't pay the premium for water view! My 2 loved the room, big telly, fast wi-fi. Great staff, really helpful concierge - restaurant recommendations etc, and they love kids! It was also a good morning walk down to the Pier for the Alacatraz boat trip. Top tip, pre-book and get the first boat out, much quieter and calmer.
Monterey Bay Inn was great, right at the end of Cannery Row, parking underneath the hotel. Fantastic big bathrooms, comfy bed, balcony. This was our only hotel that we didn't have as a family room with all 4 of us in. The Aquarium was great, pricey but we just took our time there and had a great time. The jellyfish exhibition is incredible. We had a good supper at Bubba Gumps and another great meal at a Mexican restaurant, El Torito. (There was also a useful launderette within walking distance!)
Definitely worth doing the 17mile drive around Carmel/Monterey, we got some of the best photos of our holiday from there, the sea, colours, views were stunningly stunning!!
Feel free to message me if I can help anymore