11:30 is fine. You'll be on the ship ready to eat lunch and explore!
CarnivalSensation February 2015
Carnival Dream November 2015
Carnival Fascination April 2014
Carnival Elation March 2011
Carnival Imagination Sept 2007
Carnival Sensation Dec 2006
RCI Sovereign of the Seas Sept 2006
Carnival Miracle Sept 2005
Carnival Glory Sept 2004
Carnival Fantasy Jan 2004
Last year, Carnival told us 1:00 on the phone, but after reading the boards, we found out we could get on earlier....we got to the port around 11:15 and was on board and eating lunch by 12:15. Our room wasn't done yet but we just explored the ship. At the port, the luggage guys talked us into letting them handle our carry-ons too to save us from having to worry about them...BUT our luggage didn't arrive to our door til 9pm so we had no way to freshen up for dinner and the evening. So I wouldn't suggest you let them have your carry-ons. Even if your room isn't ready, you can still drop off your carryons in the room and put them in the closet.