It never ceases to amaze me the amount of people that refuse to put on suncream and opt for nothing or even baby oil or cooking oil in the naieve belief that it will help them tan quicker. It will not, it will only make you burn and then peel quicker.
A high factor sunscreen is always a good idea, a healthy white skin is far more attractive than burnt, peeling red skin.
When buying the sunscreen make sure that it doesn`t have water or agua as an ingredient, it evaporates in the heat and doesn`t help you at all.
I would also recommend a hat, long sleeve shirt and sunglasses as well to help protect you from the suns harmful rays.