Even non-beach activities such as biking, hiking, or cold-weather challenges under the sun call for proper sunscreen usage. Sweat can diminish the effectiveness of sunscreen, so reapplying waterproof sunscreen after 80 minutes is a good rule to follow.

Make sure you've got enough sunblock to cover the whole family. If you're sharing a bottle, you may need to reapply several times during the day, so remember to bring enough along. If you're not in the water, that sunscreen protection does wear off after a while and you should reapply every 2 hours to keep constantly protected.