1. 岸   shell   swimming trunks   shore   sea   Hint Half-n-half Clue   2. 海   swim   shell   sand castle   sea   Half-n-half Clue   3. 波乗り板   sea   surfboard   swimsuit   shore   Half-n-half Clue   4. 砂   wave   sea   surfboard   sand   Half-n-half Clue   5. 水泳パンツ   shore   sand castle   swimming trunks   lifeguard   Half-n-half Clue   6. 泳ぐ、水泳する   swim   swimsuit   sea   lifeguard   Half-n-half Clue   7. 貝   sand castle   swim   sea   shell   Half-n-half Clue