hi,
I think the following information would help you to plan a wondeful vacation to one of the Caribbean Islands.
When to fly - If you want to plan your vacation around Christmas, the reservations must be made in advance because it is the peak season for all Caribbean islands. From mid-December to mid-April hotel rates and flights to the Caribbean are at their highest rates. The off season is generally runs from mid-April through mid-December. During off season, there are some remarkable deals for Caribbean flights and hotel room, the ticket price will be more cheaper. The climate will be 18-25°C between December and May, and 24-35°C between June and November, July and August are the hottest months. Since you are going with children, better choose March, April or May because the weather will be gorgeous. Anyway check
Caribbean Weather for latest forecast and plan accordingly.
Which Island to choose - I suggest
St. Lucia, one of the ideal family vacation destinations which offers lots of outdoor fun and excitement for kids. It has s wondeful tourist facilities and cater to all budgets.
Where to stay - you will get a perfect accommodation idea when you visit
St. Lucia Hotels page. The major resorts are located in Rodney Bay, Castries and Soufriere and many people choose The Rex Resorts Papillon St. Lucia for a family vacation as it has spacious accommodations and stunning beach views. It ia a little expensive hotel.
The Villa Beach Cottages is an another option to stay. It offers fun playroom for parents and children, babysitting services, beach view etc., Large number of attractions are located very near to cottages including 11 natural attractions, 5 historical sites and Castries.
travel tips - Take jacets and winter cloths for your kids if you visit in winter otherwise take cool, comfortable clothing.
Have a happy day!