After trying to climb the rock the first time, go west to the hydroplane area and look inside the hatch to find a tank of water, a tool, and a can of anti-slippage spray. Use the anti-slippage spray on the rock to climb it.
Find sunflower seeds by searching the sunflower seed remains on the balcony to. Fill the hanging bottle on the balcony with the bottle o' grog, then leave the area and return to search again to find more sunflower seeds. Give them to the parrot in the cabin.