If!!! he can use a computer there are some quite fun stratagy games like CIVILIZATION which are not too demanding at the easy levels.
There are some great model aircraft - radio controlled - which are fairly easy at the basic level and are fun to 'build = put together' and fly.
There are some good creative writing courses but that may be too demanding.
I am into boats in a big way -
www.michaelbriant.com/sailing = There are small dinghys and things you can build in the garage - let me know if I can help with suggestions -
I got a lot of pleasure from building a web site - more knowlageable people than me on this forum.
Photograph Albums for all the pix laying around the draws in the house can be rewarding.
Colleciting things is also good.
The above are my sort of 'toys' - I have been trying to think what I would do if I had AD but I guess it would be going sailing and fogetting it all.
I think your problem with finding things for your husband to do goes to the heart of the problem of sufferers - their world just gets smaller all the time - but I also get the feeling they want it to be that way.
good luck
Michael