Luggage and bags:
You will not need to many bags. Just 1 or 2 suit cases. Remember...Unless you stay at a fancy hotel, you will have to take you own bag to your room so don't make it to heavy.
Clothing/Shoes/Weather Gear: You'll need a swim suit, of coarse, and some sandals and flip flops for the beach (the sand gets hot), A couple of nice outfits to go out in. Nice, but comfortable enough to do you activities in. Mostly just casual summer wear.
Toiletries and Medical Supplies: Bring Shampoo, Conditioner, and soap. Don't forget a razor if you shave and some shaving cream. You may want to bring some Advil for aches and pains... a long drive can get irritating. BRING ALOE OR VIETMIN E FOR SUNBURN!
Photo Equipment: A water proof camera!
Camping/Beach/Outdoor Gear: SUN SCREEN! The highest SPF will be better. We always rent a chair and umbrella (it's like $25 for 3 days) because it is easier than packing and hauling all that stuff back and forth. Bring SUN GLASSES! The sun is very bright.
Miscellaneous: You may want to bring a trash bag or some kind of bad for your dirty clothes.
I usually go the last of June, or the 2nd or 3rd week of July. So if you are going around this time. Bring your normal beach wear. Keep in mind that you will want to dress up to go out, and also keep in mind that when you go to a restaurant they will have the air conditioner on, and if you got sunburnt that day, you will be cold. Not cold enough to wear a jacket, but chilly. Unless you are going to a very fancy restaurant, and yes they have some, you're cool to go casual.
Toiletries and Medical Supplies: First aid kit wouldn't be bad for any travel. Take your own shampoo, conditioner, and soap. Garbage bags for your dirty clothes, unless you plan to wash your clothes in Panama City Beach. May want to take a roll of toilet paper just in case.
Photo Equipment: You shouldn't have any problems with your cameras here. It would be a good idea to buy extra film to take, otherwise you will be paying $1-$2 more per roll of film.
Camping/Beach/Outdoor Gear: Sunglasses.....the beach is white, and blinding. Sandals or flip-flops for the beach...the sand can be a litte hot. SUNTAN LOTION.......get plenty. Preferably waterproof. A hat, or cap, might help out as well.
Luggage and bags:
Don't take much luggage. Everything you need you'll be able to buy in local supermarket Walmart.
Clothing/Shoes/Weather Gear: If you go from Europe during your summer vacations, just don't take much clothes. weather there is very hot, so take just some t-shirts, shorts, skirts and of course bikini! :) Water is very warm.
Photo Equipment: You can buy photo equipment in Walmart, and it is cheaper than in Lithuania.
Miscellaneous: All u need u'll find there :) Great place! Worth visiting!