In order to access the island you have two options: You can stay at the Renaissance Hotel since it’s included as a hotel perk, or you can pay a $125 fee for access to the island for the day.
Renaissance Island, where Flamingo Beach is located, is a private island connected to the Renaissance Aruba Resort and Casino, which is located in the main shopping area of Aruba. It’s somewhat close to the cruise port and the airport in Oranjestad.