Hi Spook,
I was in Roatan last October on the Legend and there is nothing at the pier, not even a building, although there was a rendering of what will eventually be a cruise port. Even the small village had nothing but some small shops selling trinkets. I'm sure there are some on the island (maybe at or near the airport) but you might have to do a internet search to see and maybe have them pick you up at the cruise port if you want to rent one. There were however plenty of taxis to take you where you wanted to go. Enjoy your cruise!
Happy Sailing!!

Future Cruises:
Carnival Legend - September 2009
Past Cruises:
Carnival Imagination - September 2008
Carnival Legend - October 2007
Carnival Imagination - January 2007
Carnival Imagination - September 2006
Carnival Fascination - May 2005
Carnival Imagination - November 2004
Holland America Zuiderdam - May 2003