RCl or CCL cruises are probably the best bet here. Where you go is up to you, but if you live near a port city, a cruise leaving from it may be the best choice as without airfare, it will be easiest on the pocket books of all involved. I would go with at least a 4 day cruise but recommend a 7 since the first and last day really don't count in that they are spent embarking and disembarking.. have fun..
CCL Fantasy 1990 CCL Celebration 1995 CCL Victory 2005 CCL Conquest 2005 CCL Spirit June 2006 NCL Dream October 2006 RCCL Mariner OTS June 2007 CCL Freedom June 2008 CCL Holiday July 2008
Carnival is famous for the your age group and they're cheaper too. From my experience, Royal Caribbean looked like it was more families, but maybe that was just the 3 that I went on. I also found that shorter cruises tend to have more younger folk. Longer cruises attract retirees, people that have more time to cruise.
I'd put in my vote for Carnival as well. The demographics do depend on the time of sailing and the number of days, however, Carnival typically has a younger crowd. Enjoy!
I don't care what cruise line you go on, (except for Celebrity), you're going to find young and old on any of them. They try to keep younger couples together at the dining table. The younger crowds hang out in the disco's and bars.
Shorter cruises on the Carnival line are more festive because they are shorter and the passengers want to burn the candle at both ends and in the middle. One good trick is to book back to back on the same ship. Look at a schedule and you will see a 4 day and then a 3 or 5 day cruise that go to different places. I was told by a Carnival rep that if you do this you can have the same cabin and stay on the ship without having to get off in between the 2 cruises. This will give you a 7 to 8 day cruise with younger players.