Jimothy Is Lost (Remastered)

With the last of his fuel, Jimothy makes his way to the blue planet. He activates water-landing mode, and safely lands in an ocean that spans as far as the eye can see. The only land Jimothy can spot is a small but elevated island, with sharp cliffs shielding it from the water. Jimothy uses his Jimnitech Substance Identifier to discover that the planet is indeed covered in fresh water. Parched, he starts slurping with his tongue like a Jimcat. While he's drinking, he spots something like a wall in the distance. As it approaches, he realizes it's a wall of water - a tsunami. He quickly comes up with three ways he could protect himself. He could activate submarine mode on his ship and go underwater until the tsunami has passed. He could also fly off the planet. He doesn't have a lot of fuel, so there is a risk of getting stranded in space. Or, he could fly his ship to the top of the small island.

What should Jimothy choose?