Im very pleased you are going to corfu for your holidays this year, wherever you are going im sure you will have a lovely time, corfu is a very beautiful and interesting place.
As for getting a tan, corfu is a very hot island and if you are not careful all you will get is bad sunburn. If you want a nice tan the best way to get it is to take it slowly day by day, do not do what i have seen other people do and bake all day in the sun as soon as you get there with a very low factor sun cream on!! that way you will go home with less colour than you started with as your skin will just peel off!!. It also depends what skin type you are too hodgins, if you are fare skinned you are not likely to go home with a very dark tan, but whether your skin is olive toned or very pale, always use a very high factor sun protection, it doesnt stop you tanning, it just stops you from burning! make sure you re-apply religously and drink gallons of water too!!