Duo Kayaks or Tandem Kayaks are super fun, and are a great way to get non-paddling friends on the water. There are a number of Duo kayaks available that are suitable for both flatwater and whitewater use.
All of the Duo kayaks shown here can accommodate two adults.
A quick run out in my new (to me) Eskimo TopoDuo. I had been after one of these for years. I’m quite impressed with the updated version. I also had a chance to try to my GoPro handlebar mount fixed to the grab handle. It worked pretty well.