Don't trust yourself alone in strange waters.

Don't leave your anchor at home.

Don't forget your oars.

Don't sit on the gunwale-the edge of the boat.

Don't alter course too suddenly.

Don't let go the helm for an instant.

Don't mistake caution for cowardice.

Don't be afraid to reef.

Don't let your gear get snarled.

Don't jibe in a stiff wind.

Don't get rattled.

Don't sail with "fool" companions.

Of course, there are many other "don'ts" that will suggest themselves
to the sensible boy; among them, "Don't fail to keep your boat pumped
out or bailed," and "don't forget to carry an anchor of some sort,"
and not the least important," don't leave your eatables and drinkables
ashore."