Please, if you do one thing, wear sunscreen, and if you do two things, visit the dermatologist regularly to get yourself screened and checked for melanoma.
There are plenty of options to choose from. Like I said, melanoma is rising in places on the body most wouldn't think would be suseptable, so be sure to cover yourself thoroughly.
Here's a list of high quality sunscreens as reviewed by myself for Examiner.com. No excuses now, ladies and gents.