Dave:
Given your timeline for getting to Powell River, Plumper Cove, though a decent anchorage, isn't far enough for you to go today. You could get to Secret cove easily, or even Pender Harbour, both of which offer great anchorages. Even Smuggler Cove, though small, is very cute and a decent anchorage.
You are facing a strong ebb current from now till just after noon, so if you are going to go through Active Pass this morning, you will be pushing against it. No biggie, as in Active you shouldn't expect it to run more than 4.4 knots at 11 am. I have done Active against the current many times. If you hug the Maine Island side you will find yourself in a back eddy for almost 1/2 the distance, helping out a lot. The downside of taking that route is that you will miss the much more scenic trip through the Gulf Islands. I prefer staying inside the Gulf Islands at least as far as Porlier, for the scenery, or if I am going to cross to Merry Island, as far as Gabriola Passage. This adds a few miles, but is far more worth while for the scenery. Today's current through Gabriola will be at peak flood at 16:30, so will be a great help, should you go that way.
Just my $0.02. You will enjoy cruising here whichever route you choose. You might even see the local pod of Orcas if you go Active Pass.