Yes, you're going to beaches and will probably be going hiking. There will also be a lot of outdoor shopping. Keep in mind, though, that you will also most probably need dressier dinner attire. That means clothes and footwear. This is especially true if you're going on a cruise. Most cruise ships have a dress code for dinner. Even on your own, though, you will definitely want to go out at night looking a little bit spiffy. It would complete the experience.
Don't go overboard and bring clothes and shoes that are too formal, though. Neither should you lug heavy suitcases of clothes and footwear. Some light pieces that you could mix and match to create night and day pieces that can go from casual to dressed up would be perfect.
For women, some swimwear, such as maillots, can double as dressy or casual tops for skirts or pants. Just make sure they're not too bare.
And please don't forget the skirt or pants. Swimwear by themselves are for the beach or pool side but are not acceptable to walk around town in even if it's a seaside town. This goes for the guys, too. Please throw something over that bare torso and those swimming trunks.
Ladies can do well with light coverups that double as dresses. If you plan to use them off the beach or pool, choose ones that are not too sheer. They should cover, after all.
Another wise choice for both sexes would be light and light-colored breathable clothes. You will thank yourself once you reach hot climes. Sunglasses and hats would also come in handy.
If your trip includes trekking or climbing, make sure you have appropriate clothes and shoes for that, as well. If inexperienced, ask for advice from experts. The right clothes and shoes are necessary not only for your comfort but also for your safety.
If you wear glasses or contact lenses, bring back ups. You don't want your memories of the Mediterranean to be all fuzzy.
Never forget your camera. Bring protection for it if it's not waterproof, and bring enough batteries for it and any other gadgets. If you need to bring chargers, bring universal plug adapters and voltage converters.
Binoculars would also add a new dimension to your experience.
It's always wise to bring small packets of your own brand of toiletries, enough to last you for the entire trip. You never know if they - or any counterpart acceptable to you - would be available. To protect yourself against the sun, bring lots of sunblock and lip balm. Also guard against insects with repellant.
Always have a flashlight with you everywhere. Find a small but powerful one that you can slip into your bag or pocket.
Also find a slim wallet for your money and passport that you could have on your person almost all the time, except of course while swimming. Plan ahead on how to keep these safe otherwise.
