Madpae has a great summer hunt at the moment. Go buy a hud (only 100 LS) and search for shells on all sims over SL. The hud will show you on the radar where you can find the shells and take you to the next sim.
With his hunt you can earn a lot of prices. One of the prices you can win, are these great beach items from Serenity Style.
Here is the info about the hunt: http://www.madpeagames.com/summer-hunt/