Just outside the Princess Gates, go east and keep close to the lake, there always used to be free parking along the side of the one way street through the park there. also used to be motorcycle free parking up near the exhibition streetcar stop, or did they get rid of those places?
Just please take it slow on that road. Lots of people in the area walking, running, walking dogs. I'm there every day waling my dog and have seen a few people almost hit by people flying through the park.