I feel deprived answering this after reading all the others, but I have been 3 times with trip 4 and 5 in the planning stage.
First trip we (hubby and I)took our only child at the time, her cousin and my MIL, total of 5.
Second trip, hubby could not go, so I went with my mother and children #2  (#1 was a mother herself by that time).
Third trip, self, hubby child #2  again along with a friend of #2.
Planning with reservation trip four, will be my mother, myself, and my #2 daughter. 2009
Planning trip five, just hubby and I on one of the land/sea cruises, 2011. This will be after last child has graduated HS, we will be free!