Is there any way to prevent tanning while out in the sun (such as using sunscreen)?
sunscreen will prevent tanning if you take one that has a good protection (go for at least 40 FPS). Anything that blocks out UVs will do the job. If you plan on being out in the sun for a whole day, apply a good amount of FPS 60 or more at least 30 minutes before going out and also re-apply whenever you go bathing or sweat a lot, or at least every 5 hours. Anthelios XL by La Roche-Posay is very good. And wear a nice hat, it’s stylish and will protect your head.