Apply sunscreen 30 minutes prior to sun exposure.
Limit your time in the sun & be mindful of the UV index.
A helpful link from the EPA can be found here.
Keep sunscreen, sunglasses & hats accessible at all times.
Consider purchasing SPF protective clothing as an additional measure of protection.
Check Your Skin regularly & note any changes.
Take a picture as a source of reference.
Should something "pop up" that is of concern, see your doctor for immediate treatment. That ensures a more successful outcome.