We took the 3-day Baja cruise in December on Monarch. The pool was open, but I don't know if it was heated. On the sea day they basically find a sunny spot and kind of float around for the day. We could see the Paradise from the Monarch for almost the entire cruise and they looked to be doing about the same thing we were doing.
It is really fun to watch the two ships sail side-by-side towards Ensenada.
Monarch of the Seas - December 2006
Elation - April 2006
Sensation - May 2005