Went twice this year with a group of 9-10 people. We booked two 2-bedroom suites and was very pleased:
Whistler Creekside Hotel | First Tracks Lodge - older but slightly larger space (dining and tv area)
Whistler Creekside Hotel | Evolution Whistler - newer but slightly smaller space
Most suites in Creekside also have 3 or 4 bedroom suites. But they might be low in availability or require you to stay a minimum number of nights. At least I wasn't able to book them a week before my arrival date.