My Summer To-Do List: Practice wakeboard front flip Host late-night island party Build a bonfire Seduce Todd Chelsea's more comfortable strapped onto her wakeboard on Lake Tahoe than laced into platform espadrilles--or flirting with Todd, the adorable watersports instructor she's been crushing on for years. So instead she concentrates on winning this summer's Northwest Extreme Watersports Competition. That is, until Sebastian, a hot Brazilian tennis...