I would like to leave around 10:00am. Go out through Manning park, hit Princeton(maybe a bite to eat there), take Hwy 5A to Merritt, Hwy 8 to Spence Bridges, and then Hwy 1 back home. It's a relaxed ride for the most part. Let me know if you're intersted. It won't be a race and the faster people will wait for the slower riders to catch up every now and then. No one gets left behind. Return time should be around 6:00 or 7:00. That's the reason for the late leave also. All the city traffic will have died down by then!
Here's a link to Byron's site where you can check out the map for Merritt Loop.