If you’re booking De Heeren @ sea, expect a small, intimate liveaboard or private charter along the Peruvian coast, so space and facilities are limited and you should pack soft bags, seasickness meds and layered clothing for cool mornings. Book early and confirm the exact embarkation port and pickup times, tell the crew about any dietary restrictions or mobility issues, and bring some cash for port fees and tips. Bring a power bank because outlets and reliable internet are scarce, carry your passport or ID, and be ready for weather-dependent itineraries with a mandatory safety briefing before you sail.