nah, go for it... as long as the ship clears customs on time, everyone is usually off the ship by 9am, so they can turn the ship around for the next cruisers who will be arriving around 10 a.m. and waiting in line to get on around 12 noon!!
We had a 3pm flight, we didn't feel like renting a car for a few hours, so instead of hanging around the airport for 5+ hours, we reserved a day room at the Hyatt, we were off the ship by 8:30 a.m, at the Hyatt by 9:30 a.m. and could rest and relax until our flight.