When Liz Lauter heard that MarinArts was organizing a countywide scavenger hunt, she jumped at the chance to volunteer the San Geronimo Valley Community Garden as a featured stop. Ms. Lauter, a Forest Knolls resident and the garden’s coordinator, hopes that visitors stopping by during the month-long hunt will see “what’s possible.” “They’ll see a garden in full bloom,” she said. “I hope we inspire other people to do it.” Discovering treasures hidden in plain…