So how do you get involved? If you're not going to this Wednesday's invitation-only event in New York City, you can bid online from now until then at the charity site charitybuzz.com. The charter package, valued at $245,000, permits 10 to 12 people to cruise aboard Hemisphere in either Croatia or the Caribbean. The Croatian itinerary is set for this September, comprising eight days and seven nights. The Caribbean package is the same length of time next February. Either way, a crew of 10, including two PADI dive instructors, will attend to your needs. You'll have a variety of watertoys, ranging from waterskis to windsurfers, to enjoy, plus the spacious accommodations of Hemisphere herself.