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Summer vacation should be relaxing, but who wants to spend a day at the beach just tossing Frisbees and watching sand castles implode at high tide? These sites will help you get your feet wet in some more scintillating seaside activities. Remember to leave a shady spot on the blanket for your laptop.

?www.american-sailing.com
Cruise around the American Sailing Association's site to find the nearest ASA-sanctioned school, where you can get certified to sail at any level, from basic keelboat to advanced coastal cruising.

?www.windsurfer.com
This windsurfing cyberforum has lessons for beginners and technical tips for more experienced surfers, as well as equipment reviews, weather reports and listings of the smoothest seas around the country.

?www.unlitter.com/sandcastle
Forget the plastic bucket-and-shovel set: Sand Castle Central (above) features the latest in high-tech beach art, including construction lessons, a photo gallery and listings of castle-carving contests.

?www.surfline.com
Hang at Surfline before waxing up, and check weather and surf conditions around the world.

web.dreams
sites we'd like to see

?www.budnippin'.com
Have a few Buds and join the chat room devoted to dissin' the soon-to-be baseball commish.

?www.loutofbounds.org
Real-time mapping of most recent hooligan activity at World Cup.