Aruba is generally a very safe place at any time of day or night. However, it would probably be wise to stay away from the area surrounding the Valero refinery on the southeast part of the island at night in the words of a Valero employee, "you will get some undesirables down there at night". There is generally no reason for a tourist to go there at all anyway, so this likely will not be an issue.
While rarely enforced, all drug abuse - including cannabis - is illegal.
The running water in Aruba is absolutely safe to drink.It is referred to as "Sweet Water" because it is very good.
medical
The main 280-bed hospital is well-equipped both as regards staff and equipment. Oxygen tanks and hemodialysis services are available. Hotels have doctors and dentists on call and appointments can also be arranged through your hotel. Several other medical clinics also exist on the island.
talk
Languages spoken are Dutch official, Papiamento, also official a creole of Spanish, Portuguese, Dutch origin, Spanish, and English widely spoken.