The gardens are amazing, the Chinese and Japanese gardens were undergoing renovations (see photos). Lots of beautiful trees, flowers and water fountains. They had many signs with explanations of the flowers and trees. There's a trolley at the exit that will take you around for free. On our way out we decided to jump on and take a ride to the tree house which isn't what you would expect. I thought I was going to see a house in the trees. Nope we arrived at building made of wood with a balcony and just explained about treehouses. Took all of 3mins to explore, the trolley waits 10mins and then takes people back to the exit. It's a one trip stop, I guess you can't expect more for a free ride.
If you plan on doing The large tower ride, The Biodome and The Botanical gardens buy the package. The more you do the more you'll dig into your pockets. I believe we paid $35CAD for two sites each.