Psychologists highly recommend hobbies for geezers. If you need inspiration stop by the Mill Valley Fall Arts Festival on September 25 and 26. Located under the redwoods in paradisical Old Mill Park, it spotlights over 100 craftspeople mostly working in the now-classic Marin organic style . There is a children’s area with music and magic and live entertainment from Gypsy jazz to jug bands for grownups.