A nice day ride from Victoria is to do the Shawnigan Lake-Crofton-Saltspring loop. It's about 160 km, a real century ride. You take the Goose to View Royal, get on the Trans Canada and follow it thru Langford and up the Malahat (gentle grade, climbs to about 1000 feet). Shortly before the summit, you take the left turn to Shawnigan Lake and come down the hill (gentle turns but bumpy). I took the quiet West Shawnigan Lake Road, which takes you a little out of your way, but you circle around the north end of Shawnigan Lake and get back on Shawnigan Lake Road heading north thru Cobble Hill, across the Trans Canada where the road becomes Cowichan Bay Road. You basically follow this road past Cowichan Bay, follow the sign at the roundabout to Maple Bay, turn left before Maple Bay and follow the signs to Crofton, where you get on the ferry to Vesuvius. If you want some hills, take the left turn up Sunset to the north end of the island. The road comes back past St. Mary Lake and to Ganges. From here, you go up a long hill towards Fulford. I recommend staying on this road; it's actually less climbing (once you get to the top) than the lower road (left turn at Beddis). If you decide to take the quieter lower road, be advised that there are no signs to Fulford, and there are three critical turns you have to make, so take a good map! The Fulford ferry is free - you've paid the round trip fare in Crofton. When you land in Swartz Bay, you can take the Lochside back to Victoria.
Luis