From: "Meir Shinnar" <chidekel at gmail.com> but there is little basis for forbidding, for example, mixed swimming, and allowing walking on the boardwalk next to the beach.... >> Which poskim are mattir walking on the boardwalk next to the beach? AISI it is clearly Assur. See Aruch Hashulchan EH 21: 1, 2 & 3. SBA