[LikeHamilton]

The best time I have ever made it to downtown TO is 45 mins around 4 am from west-end of Hamilton by the 403. During the day it can take up to 2 hours to get there. I was there about a month ago after 6 pm and it cost me $35 to park for 3 hours. My wife goes there about once every 2 months. It is about a 2 hours one-way with GO. She would be about 15 minutes from the RHYC. If your going for a meeting then you would not have any luggage.
Taking Porter is a pain from the Island Airport. Long drive and expensive parking. Or you can take the GO. Walk what seems forever. Wait for the shuttle bus. Take the tunnel (better than waiting for the ferry ride). Then check in. This maybe if not quicker, easier. If they would get code sharing or at least check in for porter, this would make it even better.