Music! Never leave home without your favorite playlists.
A good book downloaded movie or podcasts for a relaxing day at sea.
Mask and snorkel, if you prefer your own.
Beach towel for days on the mainland. The yacht is fully stocked with plush bath towels.
Insulated bottle or cup to keep your drinks cool all day long.
Hat and sunscreen lotion — the sunshine is always strong, no matter the temperature. But check with your yacht. Many of them keep this stocked and ready for you.
Cell phone with roaming data + chargers — expect complimentary WiFi at many restaurants onshore. Most crewed yachts have basic internet available onboard.
Passport, money, credit card — you might not locate an ATM that is convenient! Be sure to let your bank know you may use credit cards offshore.
Prescriptions and motion sickness medication, if necessary
A cardigan or shawl for those who get chilly. And some evenings may be chilly to those who stay in the sun too long and get a bit burnt.