While I have seen the use of tanning beds declining in the past 5-10 years, they are still available. This article and video do a good job of explaining why tanning beds specifically aren't a good health choice.
This article gives first aid information about how to treat a sunburn. This is particularly important because my students grandparents (and maybe even parents) didn't have access to sunscreen, so there were many different ways to treat sunburn with varying levels of effectiveness. I think that it is essential to provide direct instruction on this topic to help combat any home remedies that students might have been taught that aren't effective.
I love this quick quiz. It does a nice job of activating prior knowledge by asking the questions but then debunking those myths. I have used this both in class and as an online homework assignment where students reflected on what they learned.
This short article describes several different types of sunscreens and how they can be used in different situations, such as when you are sweating or if you have sensitive skin. I always remind my students that any sunscreen is better than no sunscreen, but this information can help them get even more intentional about their choices.