If you plan on spending a lot of time in the sun and the water this summer season, I highly recommend investing in a sunblocking rashguard. While the O'Neil UV Protection Rashguard does the trick, the Sunblocker Rashguard ($45) by Title Nine does the job with a little more fashion sense.
Title Nine commissioned two surfers, both women, to design this guard, and they definitely gave the rashguard a feminine touch. The sleeves though short, completely cover the shoulders but allow for freedom of arm motion. You can paddle out without feeling restricted. The neck is also a little higher, like a mock turtleneck, providing just a little more sun protection. The guard provides both UVA and UVB protection.
Buy it directly from Title Nine. It comes in pink Punch (pictured above) or light blue Water.