Are you looking only at Whistler area? Almost in the Sea to Sky corridor is the HSCT, a long dayhike that can be stretched with peak-bagging on the way.
If not, consider heading to Elsay Lake on the normal trail, camp there or up at Vicar lakes, then summit Bishop before returning the Elsay Ridge route. Don't know the stats, but it's a pretty good day. Add Elsay if you want, or if that day doesn't cut it reverse the route, sleeping on Elsay Ridge then returning via Bishop and the Lower Elsay trail. Both are sub-alpine, but with enough up and down to compensate fully for the lack of true peaks.