Do a search, this is frequently covered.
That said, on sunny days go to 7th heaven on blackcomb in the afternoons, nice mix of treeless high alpine that blend into mid mountain runs cut in the trees.
Middle level of blackcomb mountain left side looking up has ridge runner, rocknroll, zigzag, backstage pass - fun rolling cruisers, access from crystal chair.
Blackcomb glacier is accessible two ways: easy way is around the back via horstmann glacier Tbars, steeper runs accessed by hiking spanky's ladder
On whistler left side looking up take harmony ridge and then drop into the various bowls of harmony area, symphony ampitheatre is also great terrain, more so on the intermediate level.
On whistler on right side looking up, accessible from peak chair there is good steep terrain, whistler bowl and so on.
Classic intermediate run is take peak chair to top of whistler, ride peak to creek run to dusty's bar at creekside, often has moguls, takes a long time, but the beer at the end is worth it.
some of the signature runs for advanced riders are: couloir extreme, pakalolo, sapphire and ruby bowl, plus the runs off whistler peak chair on right side when looking up.
Garibaldi Lift Co or Longhorn are probably the two classic apres spots. There is a wide variety of bars and restaurants in the village. Mallard room at the Fairmont is very civilized lounge with wood on the walls and ceilings, low key but nice.