Outdoors for all put on an adapted kayaking event for people who have had strokes.

http://youtu.be/ej9Kcio_K_0
Some people with stroke have difficulty getting themselves dressed or getting out of a low chair, so think about the challenges with kayaking. 

Getting onto a low (unstable!) surface, balance while on the water, and two working arms. Until you adapt the activity anyway. 
I love to see people getting involved in activities, regardless of different physical abilities.