As you already know, some of these choices are simply a way to "kill some time". But some other fun hobby ideas will actually relax your mind and body, and help you grow your skills in the process.
Word List Twists _ Choose an interesting theme, make a word list, and then use only half the words in the puzzle. I once made a puzzle about roses for a newspaper. I called it "A Thorny Puzzle." I included a list of 22 words related to roses and then asked the solvers which 11 of these words were actually in the puzzle. Or, write a listless word search. For Grandpa's vegetable puzzle, for example, you could hide the names of ten vegetables and not tell him which ones they are.