Hi Susan,
There is a Greyhound Station located right in the heart of Whistler Village that makes multiple trips per day to Vancouver. This of course goes through Squamish en route to the Vancouver. The area you are mentioning for viewing Bald Eagles is about 10 km north of Squamish called Brackendale. The best time of year to see this spectacle is during the salmon runs in the fall. Many of the eagles move on after the feast has run it's course. There aren't many species in the Squamish area that can't be found closer to Vancouver with greater ease.
The Eagles are now in great numbers at an area called Boundary Bay, just south of Vancouver. Great for raptors including Snowy, Long-eared, Barn and Short-eared Owls, Northern Harrier, Rough-legged and Red-tailed Hawk. This fantastic spot for birding is quite easily accessed via public transit from Vancouver. The Greyhound lets you off downtown. From here you can take buses, the skytrain, seabus and rent bicycles in order to get around.
The most convenient place to bird in this area is Stanley Park. World-renowned, and for good reason. It's a spectacular place, especially when you consider how close it is to the hustle and bustle of the city. I would suggest renting a bike somewhere in the West End or perhaps along the waterfront of Coal Harbour. A quick search of these locations should bring up several bike rental outlet. Beware, many of these might be seasonal.
From there, a leisurely ride through the park and around the sea wall should produce some good birds and other wildlife. You can expect to see an assortment of waterfowl in Lost Lagoon, many of which are quite tame, including Common Goldeneye, Bufflehead, Wood Duck, Common & Hooded Merganser, Mute Swan and Lesser Scaup. Friendly Raccoons are also easily seen here. Some passerines to expect are Anna's Hummingbirds, Red Crossbill, Red-breasted Sapsucker, Pacific Wren, Pileated Woodpecker, Golden-crowned Kinglet, Fox Sparrow, etc. The oceanfront here can also produce some interesting birds. Surf Scoter, Harlequin, Black Oystercatcher, Sanderling, Red-breasted Merganser, Barrow's Goldeneye, Brandt's, Double-crested & Pelagic Cormorant are all sighted regularly, Harbour Seals too.
Unfortunately I won't be in the area on those dates but I'm sure someone would be willing to show you around the area. I would suggest inquiring about this on the local birding list serve.
http://tech.groups.yahoo.com/group/vanbcbirds/
I hope you enjoy your time in B.C. , best of luck!