Anchor: You can sign on for sailing, scuba-diving, and wind-surfing courses, and water-ski on its tranquil waters.
Entailed: You can do many water sports in and on its calm waters.
Contradiction: You can do lots of mountaineering in the waters. 
Contradiction: These steps are the last steps necessary to using the best practices available. 
Contradiction: Three people are jumping.
Contradiction: There was no arranged place for the married men to stay.
Contradiction: A dog runs on the grass.