I went during the ski season and even though I don't ski there are things to do. There are two mountains, Whistler and Blackcomb. I was able to take a chairlift up to the top of the mountain and from there they have a Peak 2 Peak gondola. The views are amazing. They will even take you down the mountain on a sled if you want the rush of going down but don't want to brave it yourself! They have a Tube park, dog sledding, snowshoeing or you could attend the Fire and Ice Show.
Don't like the winter, during the summer you can hike the mountain and for the real adventurous they have bike trails! You can go on the Cloudraker Skybridge or zip lining, the possibilities are endless. The village has a lot to offer with music, shopping, dining and a grocery store, all within walking distance if you stay in the village.