PALMAS DEL MAR, PUERTO RICO—The future 150-room Regent del Mar Puerto Rico resort project is now under way here 30 minutes southeast of San Juan. Scheduled to open in December 2011, the resort will be the first Regent-branded property in Puerto Rico. It will feature beachfront accommodations, 153 Regent-branded residences, three pools, a 16,000-square-foot spa, a ballroom and a wedding chapel. The resort will also be set within the Palmas del Mar resort community, which has the largest tennis center in the Caribbean, a country club, a yacht club, an equestrian center, 18 restaurants, two golf courses and a 160-slip marina.