There are two main roads in Chilliwack, and they're actually just one road with two different names. From the highway at Exit 119, running South it's called Vedder Road all the way to Yarrow, and running North it's called Yale Road.
Go North on Yale Road, you'll find old downtown, with a variety of restaurants, quaint shops, and some nice parks.
Go South on Vedder Road, and you'll pass through the commercial centre of the city, but soon enough you'll be through the city and into the suburbs, where you can find Vedder Crossing, the Vedder Canal, Cultus Lake, Yarrow, and the Chilliwack Provincial Park.
