A great activity to do together is to start a fish tank. It has been suggested that just watching fish in their habitat, their movements and their interactions with other fish can be a stress relieving and entertaining.
Allow the care recipient to make the decorative decisions with regards to what color rocks you will choose, what figurines you may put in the tank and what type of fish you would like to have. Selection of a fish bowl can be modified to a fish bowl to fit your budget. There are also mechanical fish for sale that are battery operated to swim about the tank (however, read reviews before you buy).