You guys are on the right track.....Just keep in mind the following.
What type of fish do you want to catch?
Where do you want to fish?
How much do you want to spend?
I ask these simple questions for the following reasons. Certain species are hot one week and gone the next all along the coast in the summer. In August, there are PLENTY of fishing opportunities close to home......no need to travel too far.
Go with a reputable guide, and "share" the boat for the day. Two guys is fine for the Ocean and as many as four would be fine for Sturgeon on the Fraser.
Expect to pay $2-300 bucks per day per person. Multiple days can be negotiated with the guide.
Before you shout..

.....look at the savings and the experience.
You WILL catch fish with a guide
No wasted time
No gear hassles
Nothing to do but take in the local scenery and have fun!
The money spent on Motels & BC Ferries & Gas would be better spent doing what Pippen suggested....get dropped off at Granville Island, a quick shower & change and spend the night at the local bars, and G. I. Hotel or take one of the Harbour Ferries to a buget hotel on Howe St.
If you really have to do a road trip in August I would suggest the Alberni Canal....It will be full of heavyweights heading to the Stamp....You could also go to Bamfield and fish for Hali's.......PM me if you want more info.....been many times and know some great guides.....Try camping and save even more!!..Ortho 8)