My wife and I go every year in February(I am also a farmer). We think it is a wonderfull time to go. It is the dry season so weather is very nice. It is also high season so lodging is a little more expensive, but I wouldn't consider it crouded.
We usually base ourselves on Ambergris Caye and do a trip or two while we are there. Placencia is nice but a little too laid back for us. It is also a longer trip out to the reef for snorkeling or diving. I guess it depends on what you want to do while you are in Belize.