So, lets not let them spoil your holiday. If you take all our advice on precautions then you can eliminate or minimize their nuisance value. With a little forethought and planning they can be avoided, some methods are more effective than others - find the one that works for you.

Bring with you a good anti mosquito skin application, lotion, roll on, whatever. Autan, Jungle Juice, Johnsons  “off”, Tea Tree Oil and Citronella - all are effective. Tesco's produce a good after sun lotion with an insect repellant in it. Cover yourself all over with it as part of your post shower routine. I tend to prefer the pump spray ones, being a bit greener and doing away with the expellant gas. Before going out in the evening apply your repellent to your skin - especially arms, legs and ankles. If you are a particular 'target' then liberally spray your clothing as well.
To prevent them getting into your room at night, before leaving,  use one of the little plug in things available from all the local supermarkets, you will need one for each bedroom. They either come with a jar of fluid which you leave plugged in 24 hours a day, which should last for the whole holiday, or a small unit which has a hot pad on it, where you put a new tablet each evening. For this one you buy a box of tablets separately (it is in fact a piece of impregnated card). It seems to be personal preference as to which is best - I prefer the fluid ones as we always forget to replace the little pads. At night when your lights are off, make sure you leave a window open (you can keep the shutters closed). DO NOT sleep with your windows closed. The mosquitoes do not like the aroma produced by the machines. This will let the mosquitoes escape. Contrary to popular belief, the plug in things repel them not kill them. You don't want an unhappy family of mosquitoes trapped in your room for the night!  (We cannot smell it though.)  We recommend sleeping with windows open but shutters closed.