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Possibly the biggest operator of short Caribbean cruises is Carnival. These are sold as 'Fun Ships' & definitely cater for the 'younger' market. Look at their website. You won't get a short cruise back to the UK, particularly in July though.....Wilba.
You could try RCI (Royal Caribbean) - they do short cruises, or maybe Princess or celebrity. As it would take days to sail from Caribbean to UK, it is not possible to return to Uk in such a short time. I think the onky way to go from US to Uk is a repositioning cruise (but I may be wrong) and that would be unlikely in July as it is mid season i.e ships will be either in the med all summer, or in Caribbean, Baltic etc. Also slightly late to be booking for this July! Last minute deals are always available but to get the cruise and cabin you want, you would need to have booked before now. Would you not consider a Mediterranean cruise from Southampton - much more feasible I would think Good luck!
The only way to cruise back to the UK in July is to fly to New York and sail back on Queen Mary 2. Deaprts 6 Jul or 30 Jul for 6 nights or you can go from Boston on 4 July (Independence day)via New York with 8 nights on board.
If you really want to spoil yourselves on your honeymoon select Silversea
If you want to share your honeymoon with hoards of kids, queue up for your 'freestyle dining' and drink coffee out of polystyrene cups then go for everyone else ! Start your life together with the best, you won't regret it. Good luck.
Not everyone has Silversea's money!! The lines that have been mentioned are Royal Caribbean, Celebrity, Carnival, Cunard & Princess, non of which do 'Freestyle' dining, as that applies to NCL. By choosing the right ship from any of those lines, hoards of kids can be avoided in July & as for coffee out polystyrene cups, never in any one of 60 cruises have I had to 'lower' myself to that level!!!....Wilba.
Wilba, I assume that you meant not everyone has the money for Silversea rather than not everyone has Silversea's money !!! You get what you pay for and these people are going on their honeymoon, something that they will remember for the rest of their lives, so Silversea is the perfect answer. No kids, no hassle, no climbingwalls no guests attired in football shirts, no queuing up for food, having a glass of champagne whenever you want it at no extra charge ! A romantic dinner, served course by course whenever you want it, in your stateroom looking out to a Caribbean sunset! (Royal Caribbean will now charge you extra for room service) When you go Silversea you do not need to spend a single penny (or cent) from the moment you get on board until you leave their cosseted care. Compare that to life on board the new floating shopping malls with cabins which is what the new large ships really are and where you are encouraged to pay extra for everything. At the end of the day Silversea is not expensive and perfect for a honeymoon !!