Try the Seabourn website, at www.seabourn.com, just had a look myself and searched for 1 to 5 nights, it came up with three cruises of 5 nights duration, in the Caribbean, each from £1084 per person. I can only assume that this is cruise only, and you would then also have to factor in flights, but it would definitely be all that you asked for. Give it a try.
Costa have a few Med cruises for 5 nights in April. Also look at RCI - Navigator 4 nights 30th April out of Barcelona.
Vision of the Seas...22March ... Caribbean 8 nights from £989
Summit...............27March ... Caribbean 9 nights from £1210
Ruby Princess .......10 April... Caribbean 9 nights from £899
Queen Victoria.......20April...Mediterranean 12 nights from £1099 S'ton to S'ton
Silver Wind..........17March ... Dubai to Dubai 7 nights from £2095 + flights
Can't go along with Costa or Navigator if you want to avoid children Regards Neil.
Give FRED OLSEN a look they have a reputation for cruises for the more senior person shall we say. I know when i cruised with them i was one off the youngest if not the youngest at 44. Still had a great time, with excellent food and over all service on the Braemar.
If you are looking for a bit more luxury and no kids go for P&O's Arcadia which is an adult only cruise ship.
Try Celebrity Century - classy ship - 5n from FLL on 20th April.
The problem with shortie cruises though are they tend to be popular with people doing taster cruises and that tends to mean they drag the rugrats along! Larger ships tend to have better childrens facilities so you rarely see them anyway.