Alan, I am not certain there are many 5 dayers out there anymore. There are a few 4 dayers. We did RCL from Miami a few years ago. Monday to Friday, hit the private island, Nassau and Key West. Our biggest problem was lousy weather, but that can happen no matter. I do, sometimes wonder why people choose a 4 day cruise when you will still be off work for a week as they nearly always leave on Mondays. I think Carnival leaves on Sundays out of Port Canaveral. If you do like the party scene you may be happy with Carnival though the shorter the cruise the more you will get a wild bunch. Just one more thing, you might enjoy yourself a bit more if you can find a friend to cruise with, know you will save bucks. Hope this helps a bit. All the short cruises will either venture into Mexico from Miami or do the Nassau thing.
NIta