Since you are on the east coast already, most of the carribbean should be in your budget or Puerto Rico... but it all could depend on when your spring break is... Places like Daytona or Paradise Island I would avoid because that would be all about the drunken college students and you'd probably get very little quiet time...
Both American Airlines (
www.aa.com) and United (
www.united.com) have vacation sites, check those out for some of your options - they are a little expensive, but they are mostly all inclusive... and it would give you some ideas.