as many people have stated you are going during a very busy time of the year... when we look at february, we are booked with our resort before we leave... example - before we left the GCP in Feb 2007, we had our November and Feb 2008 booked with Angie within the first week of our stay. the only reason we do this, is because of the popularity of the GCP for adults only vacations, and we want a certain room every february for those two weeks... so we nail it down then and there....
but if you are able to take off with short notice, then go to Funjet.com, Applevacations.com, MLTvacations.com or whatever other places you can use a resaler like these companies and start locking something in....
good luck...