Take a running jump to grab the dangling vine. The obvious path is on through the falls. Instead take a detour for a reward.
While hanging from the vine, turn left to face the cave between the ledge where Lara was just standing and the waterfall. Swing toward the cave and Jump to leap off the vine into the cave. (The in-game instructions explain how the keys work. Check your booklet or the Controls page for more info.)
As you head into the dark cave, press Delete (D-Pad Left) to activate Lara's Personal Light Source (PLS). Follow the tunnel around to the right to find a silver reward (1/5). Continue along the passage and drop down into a lower tunnel. The waterfall is back to the right, so go left.
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