PORT ST. LUCIE — Sandpiper Bay Resort has five months to restore a mangrove forest it destroyed to create a beach and unobstructed view of the St. Lucie River, according to a state order effective Jan. 8. The Department of Environmental Protection has ordered the resort to:Pay to plant 2,780 red, black and white mangrove seedlings and trees in between what's left of the estimated 944 trees it cut to nubs by June 24. The restoration project cost is undetermined, but "it's not gonna be a cheap