I've been on the Imagination 3 times, all of which were before the renovations. We are going again in September so I'm excited about the upgrades and feedback you get. I would really love to know who's playing in the Shangri La Lounge.
As for Half Moon Cay, I was there back in 2003 on Holland America and it's GORGEOUS!! Definetely a beach day....Here's a picture I took back in 2003

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