Maybe I’m different but I love sea days. You get to chill, recoup and enjoy the ship. I’m exhausted after excursions, walking exploring etc.
What have you got against Le Havre? It's very close to the picturesque port of Honfleur - well worth a visit. It's also a good starting point to explore the Normandy beaches and surrounding area which, for history buffs or those just wishing to pay respects to those that have fallen, is an enjoyable, if poignant, day out.
Pretty poor itinerary 2 days at sea, plus one of the shore days is Le Harve???
Cruise Circle has this for £581, or £677 including free wifi and gratuities. Nice little cruise and Royal Caribbean are great.
£10 off per person when booked online (y)