Write an article based on this summary:

Relax by the pool if you’re on a cruise. Visit the salon or spa if you’re on a cruise. Observe nature and sea life. Read a book.
Most cruise ships have a large pool area (or a few) with chairs, tables, and bars. This is especially fun for groups with kids, but there are also some cruise lines with adult-only pools. Grab a towel and catch some rays or go for a swim!  Many large ships also have a hot tub, which is excellent for some relaxation time in the sun. Don’t forget to wear sunscreen and re-apply regularly! Vacations are for pampering yourself, so take advantage of the onboard salon and spa to get a massage, a new haircut, or a simple manicure or pedicure for a formal night out. You’ll leave feeling refreshed! An activity as simple as watching the sunrise or sunset from the water can be extremely relaxing. Bring along some binoculars and try to catch a glimpse of some dolphins, whales, or other aquatic animals that you can’t see in their natural habitat elsewhere. Many people use vacation as a time to catch up on their reading. Pack a book from your favorite author and find a comfortable place to read a few chapters. This is a great way to relax while refreshing your mind!  If you’re on a cruise, some ships even have libraries where you can borrow books!  Reading aboard a ship may not be a good idea if you are prone to motion sickness. If you begin to feel sick while reading, put your book down immediately.