Sorry if this is a bit late.
Peoples scars react differntly to sunlight.
Some fade more, others burn easily. It depends upon you skin type.
However, i would highly recomened a suncream called P20. Its about £10 a bottle but it lasts ages. You only need to put it on once a day in the morning and your covered all day, even if you get wet.
It protects you from all the harmful rays, but it still allows you to get a tan through it. I use it all the time!
Have a nice holiday though.