Book excerpt: Larry McCoy believes in non-stop fun and ice cream as every grandfather should. He writes amusingly about adventures with his four grandkids on bikes, skis, diving boards, and picnics-from both his perspective and theirs. McCoy won awards as a newsman, but nothing has been as rewarding as hanging out with Nicholas, Rachel, Daniella, and Cristiana. Despite injuries and a pouty face or two, the grandkids still speak to him. Having saved them early on from the perils of parsley and pickles, he wishes they would take his word that sweet potatoes are good for you.