Grefter, exact arrival and departure times would be coo'.
EDIT: Though I just noticed you're flying into Vancouver. On uhh July 13th? (Remember, con date is July 24-27, Hal and Alex are only staying till Aug 4 because they, along with Snow and I, plan to do stuff in SF)
I am either presuming that you have had a sudden urge to tour British Columbia with elves and beavers or you got a date mixup. Hopefully the former, and that you also have transportation plans to SF itself from there.
As far as departure goes, yeah just make sure that you've got things to do from July 27-Aug 4. I doubt any of us other folks staying past the con mind the company but we won't be staying at QR/Gate, soo if you are planning on having company around go chat it up with 'em and Hal.
To Niu, and prospective others and those already confirmed - if you're not opting for the beach house and have alternate plans for housing, please be sure to state this... like... as soon as you're sure, so we have an idea on space, the share of the rent, and whatnot.
NEB: I'm sure I (or more likely QR) can take a broader look at hotels, but unless you're willing to drive to the con gathering place on a daily basis, finding a reasonably priced room isn't likely in the area, period. The particular Lighthouse quoted is extravagant due to being literally waterfront, yes, but expect at least upwards of 100-120 even for inland locations, and probably a 20 minute drive at the least.