<human>: I am planning on visiting the beach and want to know what type of sunscreen I should buy.
<bot>: It depends on your skin type, how much time you plan on spending in the sun, and how often you re-apply sunscreen. If you have sensitive skin, choose a sunscreen with an SPF of at least 15 that is non-comedogenic (won't clog pores). Re-apply it every 2 hours or after swimming or sweating. For people with normal to oily skin, look for an SPF of at least 30 that is water resistant and has broad spectrum protection. Re-apply it every 2-3 hours, even if you're not in the sun.