The casinos accept both citizens and foreigners, but the law limits how often a citizen can visit a casino. Aruba has its own currency (the Aruban florin) but many of the slot machines are for United States currency instead, since so many of the visitors to Aruba come from the U.S. The hours for live-dealer table games tend to be more limited, e.g. Some are open 24/7, but that usually only means that they are open for slots gambling around the clock. There are many resorts on Aruba, and a large chunk of them sport their own casino, so there are many gambling establishments to choose from here.
Many different gambling forms are legal in Aruba, including casino wagering, bingo, and sports betting.