Gary,
I envy the realationship you have had with your father...but not the illness that now robs.
My own dad didn't hunt much, till I got old enough, then I had to teach him about anything but rabbit hunting.
Mom was afraid to be alone, so his time afield was limited to day trips, but we got a few.
Now he lies in a nursing home bed sometimes clear minded, but a useless, wore out body that heart disease and a stroke have robbed of dignity and ability to do anything for himself.
As the Hospice Chaplin put it, visiting and spending time just being there is a "ministry of presence".
Prayers with you as you deal with this dreadful ailment. I embrace your shared joy for the times you've had with your dad. What a gift those times are!