Shore excursions can fill up fast. If you haven't booked them before you depart, think about doing so as soon as possible after boarding.

Remember to budget for shore excursion expenses. Excursion prices can vary greatly depending on your port of call, cruise line and activity.

If you are elderly, physically challenged or have special requirements, check with the cruise line to make sure all the ports can accommodate your needs.

If you're concerned about the drinking water and food onshore, ask your cruise director or physician for recommendations. In certain ports, some items (particularly water) may be off limits.

You're never obligated to take an organized shore excursion. To explore a city more in depth or see something not included on an organized excursion, consider exploring on your own.

If you explore on your own, you may not be covered by your ship's insurance. It's wise to check the details of your ship's policy beforehand.

If you explore on your own, keep an eye on your watch. If you miss a launch, you'll have to meet the ship at the next port, at your expense.

During a shore excursion, always carry identification, the name of your ship and its docked location. Bring a photocopy of your passport with you as well.

Leave valuables, excess cash and unnecessary credit cards aboard the ship while on shore excursions (consider using the safe in your cabin, if available).