mwielsch,
LIAT - Leeward Islands Air Transport based in Antigua has a couple of types of passes that I remember as being reasonably priced.

Here's a page that lists some of the common Caribbean air passes:
http://www.caribbeanaviation.com/passes.htm

You could also purchase a visit north america pass. Details are at this link:
http://www.oneworldalliance.com/prod...sit_passes.cfm
jerry