:  Some people think that the sun's rays are only strong in the mid-day hours.  Actually, during a hot Austin day, the UV danger is at least moderately high from 10 am to 5 pm (and possibly longer).  If you are planning on staying outside, check the hourly UV index in advance so you can prepare.  If possible, avoid the outdoors at times that are listed as highly to extremely dangerous.  Why would you want to be out in that heat anyway? 2) No sunscreen is waterproof:  Don't believe a bottle of sunscreen that claims to be waterproof.  I can't tell you how many times one of my friends has fallen for this statement and then wondered why he/she leaves the pool looking like a tomato.  Once you apply your sunscreen, wait 15 minutes or so before hopping in the water.  Then, reapply the sunscreen every time you get out. 3) Clouds and umbrellas do not protect you: Just because you can't directly see the sun does not mean UV rays aren't hitting you.  You can still be burned on a cloudy day.  Also, one of the worst burns I ever received was when I completely shaded myself with an umbrella at the beach.  The UV rays reflected off the sand and hit me without me knowing it.  This is great to keep in mind when you spend a day at the beach or on a boat because you are hit by direct rays from the sun in addition to indirect rays that bounce off the water and/or sand. 4) Reapply:  It is impossible to give a generality about how often to reapply lotion because a sunscreen's lifespan depends on the intensity of the sun, your complexion, how long you've been outside, how many layers of sunscreen you already have on, the SPF of the sunscreen, etcetera.  You should know your body and understand the conditions you are in.  When in doubt, always throw on another coat of lotion. 5) Never use old sunscreen:  If you are gearing up for a day at Barton Springs and you grab that bottle of sunscreen from last year, expect a sunburn by the end of the day.  Sunscreen loses effectiveness over time, so eat the few dollars it costs for a new bottle and throw the old one away.  $5 is worth protecting yourself. 6) Wear clothing that covers: Just because the temperature reaches 100 degrees does not mean you must wear shorts and a t-shirt.  Clothing companies now specialize in lightweight, breathable pants and long-sleeved shirts that also have SPF protection.  This way you protect your skin without needing to lather sunscreen all over you. I hope these tips keep you comfortable this summer!  Remember: all Camden apartment interiors block 100% of UV rays.  We are definitely doing our part to keep the world safe.