Hey Chris,
I'm just an Ontario boy but have been going to bc for years every summer.The biggest trees are everywhere although the best I've seen in around the islands were near long beach on Vancouver island and along the sunshine coast they are lots of places.If you are going to be checking out Saltspring island,I recommend being there on a saturday.Thats the livliest day with the market and everything going on.Oh yeah,when travelling on the ferry,the buffet is fabulous.Just make sure you are really hungry.lol