I've heard from someone that despite the Mt. Seymour PP being closed, you can still bike up the road. I don't know if this is true or not but if it is that would be a great outing and a unique time to get some bike exercise up that road without the danger of being hit by a car.
Yep, I've been up that road 4 times in the last month on a bike. Nobody seem to care. Note I only went as far as Mushroom parking lot each time.