The seas are calmer in the Western caribbean. We cruised in 5/03 and 5/04, both western, and sears were very flat. Doesn't mean they could have waves at any time. We were just in the Eastern Caribbean jan/05, and it was very rough. Was in the southern caribbean 4/03, very calm. Was in the bahamas, (atlantic) march, 04, and pretty calm.
Hope this helps out.