Treasure Island TI Las Vegas Hotel officially opened this week under Accor’s Handwritten Collection, a year after we reported the deal was in the works. The move makes the 2,884-room resort the largest hotel in Accor’s global network. Treasure Island has plenty of story to work with. The pirate ship replicas anchored at Sirens’ Cove have greeted guests since the hotel opened in 1993. On the sustainability side, Treasure Island holds a Four Green Globes certification for energy and water efficiency.