Answer
Keep visits short, supervise kids closely, report out-of-order fixtures if there is a posted contact, and leave spaces usable for the next family. Do not line-save multiple stalls. A small tip for attendants is appreciated where staffed.
Sources: Town of Ocean City · Visit Ocean City
Editorial visitor guidance for Ocean City, Maryland. Confirm current Town of Ocean City, Maryland DNR, NPS Assateague, and NWS rules when regulations or safety apply.
