11:30 is fine. You'll be on the ship ready to eat lunch and explore!
Carnival Elation March 11
Carnival Imagination Sept 07
Carniival Sensation Dec 06
RCI Sovereign of the Seas Sept 06
Carnival Miracle Sept 05
Carnival Glory Sept 04
Carnival Fantasy Jan 04
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.