The Neptun of Marstal is more than a restored Danish sailing ship. Operated as a non-profit sail-training organization, it invites people of all ages to swap screens for sails, learn traditional seamanship and discover how caring for the sea begins by experiencing it firsthand. Along the way, strangers become crewmates, old maritime skills are kept alive, and the voyage offers a powerful lesson in environmental stewardship, cooperation and the enduring value of learning by doing.