12:30 sounds good for me, Kim.
From the RBG map it looks like there is parking across the road from the rock garden. Dh says that I CAN exit onto Hwy 6 N, coming from Hamilton direction. The ramp goes to the left. Does John agree? Then I would get on Plains Rd and head down to York Blvd to the Rock Garden. The map doesn't show exactly where the Tea House is located but I imagine there are signs.