Luggage and bags:
Backpack to carry your picnic
Clothing/Shoes/Weather Gear: Shoes for the beach, a sweater or jacket for the sea breeze, sunglasses and a camera.
Toiletries and Medical Supplies: Sunscreen
Photo Equipment: Camera with a zoom lens is great for lighthouse shots and kites.
Camping/Beach/Outdoor Gear: A towel for the sand and a shovel and pail is great. Even a kite if you're so inclined.
Hiking boots and rain gear! Nothing fancy, we lived in jeans and jackets. They thought it was a really warm day (the day we arrived) at 65 degrees!
Toiletries and Medical Supplies: Be sure to have bandaids if you're breaking in that new pair of hiking boots.