I continued my climb up the Great Tree and at the top, I met a Kikwi hermit named Yukon Cornelius Yerbal.
He told me that I needed to open a gate with an incomplete symbol. So I had to find a matching symbol, which he marked on my map. I then had to go to the gate and use the Wii remote to draw on the gate.
Once I drew it correctly, the gate opened. I then had to take a flying leap into the water.
I ended up in Lake Floria with some Zora-like water creatures.
One of them took me to their leader Faron, warden of the woods.
She agreed to lead me to the sacred flame, but only if I fetch her some sacred water to recover her wounds from fighting with the Demon Lord. Smurf-Fi took a sample of the water so I could douse for it. A path led me back to Faron Woods, but not before I passed by a beautiful waterfall.
Before I reached the sacred water I needed, I saved my game.