This section plays just like the horseback riding part in Round 2, except
you're on a surfboard this time. This time, if you see a blinking warning sign,
do not jump over the boat that appears afterwards. The idea is to ride to the
end of the boat, then hold C to make a long jump while grabbing powerups in the
air. You'll know what I mean when you see it.
Use the boat to get the shurikens and POW in the air, then defeat the soldier
that is now entering the screen. Continue in this manner until you reach the
third boat, where you'll see a soldier in the background back up instead of
boosting forward like the others. This soldier will attack you from behind, so
stay towards the right and attack him when he stops shooting.
At the sixth boat, you'll find an Extra Life and an unexpected arrival.