The Costa Brava is known as the fierce coast and the rough sand - resembling very small hard stones can be a killer on your feet. Sandals and flip flops are OK but if the sea is kicking up a storm trainers or walking shoes are much more comfortable. The sand won't get so easily between your toes and you won't get your feet wet walking along the promenade
Camping/Beach/Outdoor Gear: under construction
Luggage and bags:
A fold up bag is useful to bring presents back.
Clothing/Shoes/Weather Gear: If going out of season consider taking a small umbrella. They are expensive to buy in Spain. Also afleece or similar warm jacket.
Toiletries and Medical Supplies: An electric 'plug in' mosquito 'zapper' is cheap to buy, small to pack, and will keep the pesky things from biting you in your bedroom.
'Autan' or a similar repellent is good for when out walking in the hills or beside water.
Photo Equipment: Your camera.
Miscellaneous: If you bring your alarm clock radio with you as I do, and it runs off the mains, don't forget to bring your converter plugs with you as Spanish plug sockets are TWO PIN ROUND !
Voltage is the same as in England BUT where as our voltage is closer to 240v AC, Spanish voltage can go as low as 206v AC, especially at peak demand times. Your appliance will work o.k. but say, a kettle will take longer to boil.
Many people bring their mobile phones with them but DO remember that a call from the UK will cost YOU even to receive the call. If you are going for a long period, consider buying a Spanish mobile phone, two if you are going with company. Then you can keep in touch with each other when at different locations and CHEAPLY.