Beyond things available through the cruise line there is not much to do. Depending on the day most shops and attractions will close at or before 6 pm, & many resort beach day passes expire at dinner time. A few restaurants downtown may stay open past 9 pm.
There are casinos at the Wyndham Crystal Palace, Sheraton Beach Resort, and Atlantis. Atlantis also offers dance clubs and on some nights shows similar to what can be found in Atlantic City, NJ.
Additionally a few private boat owners may take advanced private reservations for an evening sail. And of course there is always Senor Frogs between the straw market the the Colonial being open into the wee hours of the morning.
Vacation Countdown Clock Generator
April 2013 Carnival Splendor
May 2012 Carnival Miracle July 2011 Carnival Glory
October 2010 Carnival Pride September 2010 Carnival Glory
Sept 2012 RCCI Explorer of the Seas Aug 2003 RCCI Sovereign of the Seas
July 1992 Premier Oceanic June 1992 Premier Oceanic May 1990 Premier Atlantic