Anchor: I did, sir.
Entailed: I did do it.
Contradiction: I did not do it.
Contradiction: Two men are playing a game of Monopoly.
Contradiction: There is currently a stalemate.
Contradiction: The man was cooking burgers on his grill in the backyard
Contradiction: This might fit the description you are looking for, a gentle surf, coral reef within swimming distance to shore, and rocks and seaweed for snorkling.