I live in Fl; I will be traveling to Costa Rica in March. Any advice on both traveling and airfares?

First off you do not need a visa in order to go to Costa Rica as a USA citizen. You do need a pport that is valid for at least 6 months from the time you step foot in to Costa Rica. As far as getting to Costa Rica there are many direct flights via Miami to San Jose Costa Rica. TACA Airlines a href="http://www.taca.com" rel="nofollow"http://www.taca.com/a has good fares but there are many of the major airlines who fly there like: Delta, American, Continental, US Airways, etc.... So in short you do not need to fly via Mexico.