Second, being there two weeks, aside from the basics of Fisherman's Wharf, Alcatraz, etc. I would recommend taking a drive down the coast to Monterey Bay (about 100km) or up to the Redwood forrests (400km)
We were supposed to be there for three months but HR forgot to apply for the L visa we require with enough time for it to be processed so we're traveling under the visa waver program for 2 weeks.
Monterey Bay sounds good. I'll see if I can organise a hire car Thanks
In general, when tipping in a restaurant, just double the tax and round up (if service is good). It makes it easiest to do it this way, really.
Don't forget you need to pre-register with the US before you fly. Check with your airline's website, they should have a link to the appropriate US website to register.
I would highly recommend renting a bicycle from the water's edge and cycling over the golden gate bridge and then on to Sausilito. It's not a very hard cycle if you do it only one way - the return has a short nasty uphill so unless you enjoy the hardwork go only in one direction. The bike rental companies provide you with a ferry ticket so you cycle over and then catch the ferry back - it makes for a great outing.
I use to travel to SF once a year and always scheduled a day to do this.
I would recommend you plan to take most of the day but it can be done in a half day.