Layered clothing works the best so you can adjust to temperature changes. Bring rain gear. Even if it does not rain it makes a great wind break, will keep any spray off, and will keep you warm. Water resistant shoes are also suggested to guard against rain or ocean spray. Pack your things in a small backpack.
Storage space is limited on the boat, so try and be as compact as possible.
We do not have space for large coolers unless you re part of a large group. Fanny packs are very useful for keeping food, drink, notebook and other supplies close at hand. They are a must if you are to have a successful trip. Spotting scopes are useless on the ocean. Seasickness is possible.