I've done this trip rwicw so here are some ideas on the excursions as asked:
Frisco bay boat trip[/b]: I personally don't see this as a necessity, you can see the bay just as good from the land! I preferred to spend my time exploring frisco area a bit more, by doing the tram car ride, go all the way to Nob Hill its well worth it and try to snag an outside seat, just remember to hold on!
Also, spend free time going to Couits Tower, great views of the area on a clear day, Walking around Chinatown is fun, also Haight-Ashbury area is fun for the hippy vibe. Pier 39 of course is a must, especially to see the sealions if they are all up on the platforms. Be prepared for the smell!
Do go to Alcatraz, the sense of how brutal people were treated in prison is palpable. Also spend a bit more time on the bridge, maybe walk/cycle across and catcxh the ferry back.
🅱Universal Studios: This was an included trip when I did this holiday, must be only money the reason they made it optional. But it is still worth doing, lots to see and loads of rides if you're brave enough, the time goes very quickly when your there. For me this is a must do.
Also in your free time try and get to Hollywood, downtown LA and Beverly hills, we went to Rodeo Drive and the spectacle of the vacueuos rich set is amazing and the shops unreal, great fun!
The Vegas show thing, I think the Rat Pack show is not that good and a bit dated, unless of course you love the Rat Pack. We organised our own show, saw the Jersey Boys, it was one of the best shows i've seen in decades,
For the Grand Canyon, the 3 in 1 trip seems to be the best value from everyone that went on it, did not hear one grumble (apart from having to get up 3:30am, and being knackered when they got back!).
Can't remeber about the rest of the optionals, if someone reminds me I can give some info.
All in All this is a brilliant USA adventure.