Thank you everyone for your suggestions. We have now made our bookings. Due to lateness of booking airlines we have had some major issues acquiring flights and are now going to St Kitts at Ottleys Plantation. Maybe we can go to St Martin on another occasion as we certainly liked the sound of the hotels L'Esplanade especially. We ended up using a consolidator to get our flights after many attempts to do it ourselves, and the one major bonus is that we get Premium Economy seats for less than the price of regular seats. Weird, but I'm not going to complain.
Any suggestions re St Kitts, where to go, what to do, restaurants, grateful received.