As summer approaches and festival season swings in to high gear, Jam Cruise - the floating festival where everyone on board has a "back stage pass" - is preparing for its seventh incarnation.  On January 4, 2009, Jam Cruise 7 will depart from Fort Lauderdale for five days and head to Belize City, Belize and Costa Maya, Mexico on the elegant MSC Orchestra.  Performing artists include Les Claypool, Medeski, Martin & Wood, Michael Franti featuring Jay Bowman, Keller Williams with Moseley, Droll and Sipe, Gal