Cruising is one of the fastest growing forms of leisure travel today. Just look at the statistics. Last year, close to 10 million people from all walks of life hit the seas to relax, explore, learn and to have fun on the more than 200 floating cities that stop at a variety of ports around the world. One of those ports is San Diego, where there will be more than 200 stops between this October and October of 2005, and thanks to Patty Mc Duffee, who just a few months ago started her Vista business, Fielday, passengers from the Royal Caribbean and Celebrity cruise ships will be heading to Carlsbad starting Oct. 5. Every Tuesday. For the next 51 weeks.