Luggage and bags: Take it all. That's what i always say
Clothing/Shoes/Weather Gear: Take everything from your fanciest evening wear to your thong bikini and make sure you bring a sweater for those cool nights, no matter what time of year. But don't get me wrong, Huntington is pretty laid back, a pair of surf shorts and a tank top can get you almost anywhere.
Photo Equipment: Make sure you have a great camera and/or video camera, the view of the beach and those on the beach is wonderful.
Camping/Beach/Outdoor Gear: Just make sure you have a beach towel. Anything else, especially if your traveling far, you can rent at one of the many stands along the bike/skate path on the beach.