Tips
Tip 1:
Secret caves are often hidden behind rocks. Look for cave-shaped outlines in a wall and blast them to find the secrets.
Tip 2:
Use waterfalls to put out fires on your ship.
Tip 3:
The map is useful for showing unreachable areas. Once you see them, look for the secret passage that gets you there.
Tip 4:
Bump into every waterfall you see. Many of them take you to a secret room.
Tip 5:
Try to shoot enemy ships as they first come toward you. That way they can't turn their broadsides toward you and return fire. The behind-the-boat view is good for spotting and killing ships coming toward you.