If "they" are Jews, they might enjoy eating several meals, plus worship services on Friday evening, Saturday morning and Saturday afternoon-evening. The Shabbat morning service takes most of the morning and has study and singing as well as prayers. I think it's fun, but there are people who get bored. Saturday afternoon is a good time for a walk, or Board Games, or reading, or even a nap. When I had a dog, Saturday afternoons were a fun time for a very long dog walk. He liked that alot.
They prepare their children for Shabbat and light the Shabbat candles.
Religiously observant Jews would not board a plane if Shabbat were to start while in transit. The issue wouldn't be landing during Shabbat, the issue would be flying during Shabbat.
You can dance but you can't play music during Shabbat.
Shabbat shalom is a Jewish greeting which we say during the day of Shabbat. See also:More about the Jewish Shabbat
No, sewing is one of the activities not allowed during Shabbat as we are not supposed to create on the day of rest.
No, Shabbat is the day of rest during which the festive meals are eaten.
There is no issue with swimming during Shabbat, however, you wouldn't be able to shower after swimming until Shabbat ends. (Assuming you wish to be Shabbat observant.)
'Shabbat shalom', which means 'A peaceful Sabbath', is said during Shabbat - sundown Friday to Saturday after twilight.
Religiously observant Jews will never eat non-kosher foods, regardless of which day of the week it is. Less observant Jews will make a point to eat kosher food during Shabbat. Non-observant Jews usually don't pay any attention to whether or not the food they are eating is kosher.
It's kindling a flame, one of the prohibitions on Shabbat.
Blowing the Shofar is a form of musical instrument, and playing musical instruments is generally prohibited on Shabbat to honor the day's rest. However, there are exceptions to this rule, like during the High Holidays when it is allowed to blow the Shofar.
They go to their synagogues for Shabbat Friday night services and Shabbat Saturday morning services.