Shangri-la and the Green Umbrella By THÉRÈSE MARGOLIS Well, at long last, my not-so-fabulous-but-then-again-not-so-dreadful journey to the Dominican Republic (DR) has finally come to an end, so this will be the third and final installment of my journal. My next-to-last day was spent with my daughter at the ultra-luxurious Casa de Campo Golf Resort and Villas in La Romana, along