Tow the line high in the sky.
Paragliding is the perfect family adventure activity. I say this because I remember it being my first real taste of adventure activities when I was a little kid in Ocean City. You take a speed boat out into the ocean or lake and then get lifted up into the air by a parachute attached to the boat. I was even able to do a tandem ride with my aunt to keep me company so I wouldn’t be nervous. It is a very safe and fun afternoon activity fit for everyone.
Parasailing is the perfect family afternoon activity and I highly recommend making it a group activity. It can be done in many countries, to my surprise they were very popular in Thailand when I visited, and on several different bodies of water. I recommend doing this activity in a warmer climate and with a reputable and recommended company.