Depends, of course, on the area you visit. The list below is by no means comprehensive, but it will get you started. I've played them and they're all must-plays IMO, but I've bolded my favourites.
Okanagon near Kelowna: The Bear, Gallagar's Canyon, Predator Ridge
South Okanagon: Fairview Mtn
Shuswap Lakes area: Salmon Arm, Hyde Mtn
Kamloops: Rivershore, Dunes
Whistler: Big Sky, Nickalaus North
Lower Mainland (Vancouver area): Redwoods, Northlands, Fraserview