To avoid missing the boat in port, snap a photo of the "All-Aboard Time" before stepping off the ship to see the sights. It's a great visual reminder for the younger, care-free members of your party venturing out on their own. Plus, if you have a few too many shots in the local watering hole, you can refer to your cell phone camera if your brain becomes too muddled to remember what time you're supposed to be back on board.